Although I don't know for certain, I suspect the answer to both parts of your question is No. To do so (i.e. by regulation/law) would be seen as unduly affecting the commercial environment, cramp the suppliers' style - that is normally just not the British way of doing things. Fortunately (for some) EU regulation in this and any/all fields will soon not apply to the UK. Such things as the mobile roaming regulations, passenger rights, etc. may well disappear in their present form once the new regime comes about - the UK is aiming to become a commercial paradise to attract all the expected super trade deals to be had from those foreign countries which will rush in like puppies to their master.