For a ready-to-drink milk coffee, Jimmy’s Strong SlimCan is described by Jimmy’s as its strongest iced coffee; choose it only if its milk-and-sugar ingredients suit you. Sandows offers a black, dairy-free cold brew with caffeine stated by its retailer, while M&S Oat Latte is a dairy-free latte option whose caffeine content cannot be compared from the product wording alone. If you plan to carry any of them through security, check the rules at your departure and return airports before buying.
A single-serve drink with a stated caffeine amount can help you judge the serving, rather than relying on words such as “strong”. Check its ingredients and your airport’s liquid rules as well as the caffeine figure.
Sandows is a ready-to-drink black cold brew described as dairy-free and sugar-free in the Coffee Friend UK listing. Its 200ml bottle still needs an airport-specific security check if you buy it before travelling.
M&S Oat Latte Cold Brew is a dairy-free alternative to a milk latte. M&S says it is not suitable for coeliacs, so check the current label if that restriction matters to you.
Decide whether you want a ready-to-drink black coffee or latte, then compare caffeine declarations, ingredients and the rules for carrying your chosen container.
| Priority | What to check | Your needs |
|---|---|---|
| Caffeine | Look for caffeine per 100ml and per container; compare like volumes. The checked Joybuy listing states 57mg per 100ml for Jimmy’s Strong SlimCan, while Coffee Friend UK lists 40.5mg per 100ml for Sandows. Neither figure is an independent test of every cold brew. | I want to know how much caffeine is in the drink, not just whether its flavour is described as bold. |
| Drink style | Check whether it is black coffee, a milk latte or an oat latte, and whether it is ready to drink. Jimmy’s Strong and M&S Classic Latte contain milk; the Sandows listing describes a black coffee, and M&S describes its Oat Latte as dairy-free. | A black coffee would suit me better than a latte, or I may want a latte without dairy. Either way, I need to check the particular drink’s ingredients. |
| Dietary details | Read the current ingredient and allergen label. Jimmy’s lists semi-skimmed milk and sugar; Coffee Friend UK describes Sandows as dairy-free and sugar-free. M&S says its Oat Latte is not suitable for coeliacs. | I need to distinguish a dairy-free drink from one that also meets my other ingredient or allergen requirements. |
| Airport security | Check the container size against the departure airport’s current rules, then check again for a return flight. GOV.UK classifies drinks as liquids; Heathrow says it permits liquid containers up to 2 litres through security, but that allowance must not be assumed elsewhere. | If I buy coffee before reaching security, I need to know whether I can take that container through my airport. |
| Preparation | Confirm whether the drink can be opened and consumed as sold or needs water. A concentrate or pouch may require a separate drink-making step. | I would rather open a bottle or can with my food, unless I will have water and somewhere convenient to mix a cold brew. |
Jimmy’s calls its Strong SlimCan the strongest iced coffee in its own range, while M&S describes latte flavour without stating caffeine milligrams on the reviewed pages. Those descriptions do not establish a caffeine ranking across the drinks.
If caffeine content will decide your purchase, compare current per-100ml or per-serving declarations rather than flavour wording.
GOV.UK treats drinks as liquids. Heathrow’s stated allowance of containers up to 2 litres is specific to Heathrow, so a bottle that passes there may not meet another airport’s rules.
Check both departure and return airports before packing a drink, or consider buying one after security.
A drink that does not meet the applicable rule may have to be surrendered at security.
M&S describes its Oat Latte Cold Brew as dairy-free but says it is not suitable for coeliacs. “Oat” alone does not settle other allergen questions.
Read the current pack’s ingredient and allergen information for the restriction that matters to you.
A cold brew with a stated caffeine amount adds to caffeine consumed from other sources during the day. The NHS advises a limit of 200mg a day during pregnancy; that guidance concerns total intake, not just one coffee.
Check the drink’s current caffeine declaration alongside other sources of caffeine you consume.
Its 250ml Strong SlimCan is a ready-to-drink, milk-based iced coffee that Jimmy’s describes as the strongest in its own range.
A black cold-brew option listed by Coffee Friend UK in a 200ml bottle.
Its cold-brew latte options include a Classic Latte with semi-skimmed milk and a dairy-free Oat Latte, each described by M&S as containing a double shot of espresso.
Tesco lists a 500ml Unsweetened Cold Brew Coffee Concentrate in its iced-coffee category.
This pouch-format concentrate is an option if you can mix your cold brew with water; it is not a ready-to-drink bottle or can to open alongside airport food.
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For a cold brew you can mix when water is available, rather than a ready-to-drink coffee. The supplied directions say to mix one 25ml pouch with about 200ml of water. If caffeine content matters to your choice, check the current pack for the amount per prepared serving; also check the applicable airport liquid rules before carrying the pouches through security.
It depends on the airport and container. GOV.UK classifies all drinks as liquids, while Heathrow says containers of up to 2 litres can pass through its security. Check your departure airport’s current rules—and those of your return airport—before carrying a 200ml or 250ml ready-to-drink coffee, a larger concentrate or a pouch.
You can compare the stated amounts on a common volume basis where they are available, but not rank every option by caffeine. The checked Joybuy listing states 57mg per 100ml for Jimmy’s Strong SlimCan, and Coffee Friend UK lists 40.5mg per 100ml for Sandows. The reviewed M&S latte wording does not state caffeine milligrams, so descriptions such as “robust” are not a substitute for that figure.
The Coffee Friend UK listing describes Sandows as a dairy-free black cold brew, while M&S describes its Oat Latte Cold Brew as dairy-free. M&S also says the Oat Latte is not suitable for coeliacs. Jimmy’s Strong SlimCan and M&S Classic Latte contain milk, so check the current label before choosing for a dietary restriction.