It depends how sensitive you are ....
The UK has a decent amount of awareness but it stops short of really understanding (IMHO)
Equally the supermarkets stock things labelled "Suitable for coeliacs" which frequently conform to "CODEX gluten free" but are not actually gluten free.
I have presently got myself in a bit of a mess with this.
The main problems seems to be that familiarity breeds contempt combined with "a little knowledge is a dangerous thing" combined with a reasonable (by European standards) service attitude.
So you can be assured that something is gluten-free then the next thing they are putting bread on your plate or the fries have bits on and then you ask and you find they have been cooked in the same oil as battered shrimps or something... and the familiarity means they don't expect you to drop dead immediately in the resto ....
Having lived in France for 5 years I had the opposite experience. Lack of familiarity meant they had no preconceptions so they don't take it for granted if you are in a decent place... and can explain fully.
Specifically reasonably priced food in the UK tends towards coming from tins, packets and frozen (not everywhere but pretty much) .. so you might be given frozen fries containing gluten because they don't check because fries are potato (or are they).
To my knowledge Italy is the only place TESTS food.... The UK etc. just accept the manufacturers word and give very wide lassitude to gluten-free. Additionally they also have training for chefs and catering staff and they can be certified etc.
Personally I can't eat much of the UK gluten-free food... I tried again and I have been sick since I got here... and the pace of life seems to be forcing me to eat things I'd never consider in France where I cooked mainly my own food from fresh meat and vegetables.
If I had the choice then Italy would be number 1... by a long way... and I found Finland pretty much like the UK in allowing CODEX etc. and a decent familiarity breeding contempt... On top of this the food is really disgusting anyway... (even by UK standards which is pretty bad already) on top of which Italy has real skiing as well as sun.... and you won't be commiting suicide in the winter when its dark for 3 months minimum.
Ireland is quite nice and by all accounts quite coeliac friendly (haven't been there since diagnosis) but outside of Dublin people have more time ... (another problem in London is just everyone is constantly in a rush... and this is never good for getting SAFE food IMHO)
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The allergy labelling laws in the UK are strick so all process foods will list what is inside their product that cause food allergies.
Unfortunately they are allowed to sneak it in ... so long as it is below the Codex limits ... and noone actually checks anyway... and if you did pay for analysis then you couldn't actually do anything, the company would just claim it was an accident or a poor batch... no manufacturer has EVER been prosecuted for this in the UK ... they have nothing to lose really..