BT has been struck down three times over a series of TV adverts broadcast back in October 2015 which made various claims about gaming performance, video calling and comparisons between Infinity and Sky services.
For once we recommend reading the adjudication which has a raft of detail presented by BT to substantiate their claims and largely it seems Clearcast was happy with the information but the ASA actually rejected the data or the way it was presented. One interesting point is that as UK broadband connections get faster and maybe more stable is that to claim better gaming performance the difference has to be noticeable, i.e. not just shown in data but be noticeable to a human, or put another way gaming on a Gigabit FTTH connection is unlikely to be noticeably different to a good FTTC connection. Certainly in some rulings providers lose because almost no supporting data is provided, but in this case SamKnows testing, academic papers and other information was used to back up the claims.
BT does appear to have looked carefully at the issues around gaming, and identified upstream jitter as a key element, something that can be problematic for the shared nature of DOCSIS networks at times, and we have seen people leaving Virgin Media for this reason in the past, the problem is proving this all at a level that the ASA will be happy with, and that jitter bad enough to cause gaming issues can be a very localised problem.
One bit of advise for gamers, no matter how good your Wi-Fi router you will always be better off connecting your games console or PC using an Ethernet cable direct to the broadband router - though don't tell your mates as you can then blame the neighbours microwave for getting you killed in a game by causing a blip in the Wi-Fi signal.