Well Late last year latency to Ubisoft master servers that their games use to authenticate as well as for game data went from a respectable 90ms to 120ms later this reduced to 105-110ms due to a peering change by AS6453.net Other ISP's like Zen don't use level 3 peering to ubisoft , they peer directly with Tinet the only other peering provider used by ubisoft , Plusnet tried to route via tinet by changing the preference with Level 3
but because they don't have direct peering with tinet it had to go via level 3, who routed traffic in a cack handed way going via Paris adding to the base latency so that it made little difference, their only other alternative was to route traffic via BT , which going by several tracerts from their customer base would result have resulted in a even higher latency due to the way traffic is bounced around lots of internal hops prior to it actually reaching the internet, The same situation exists today, they changed nothing IMO one of the reasons that plusnet don't peer directly with Tinet ect is probably cost, and another is BT saying no,
But compared to some other isp's their peering is weak , easynet when i was with ukonline, had the best peering routing by far, the best I've experienced in the past 7-8yrs of having a broadband service , Be Unlimited peering and their laggy wholesale service via entanet sucked too