Re: "low-priority" for what?
I dunno - BT and Colt and Vodafone have big European operations that would be affected pretty badly by tariffs. It's much easier for EU based telcos to do business in Europe than it is for American or Asia Pac based ones.
Virgin is US owned and the effect of the falling pound will be that equipment costs will go up and revenue to the US parent will decline. I'd imagine the UK outfit has fallen down the investment priority list. The same is true I expect for 3 and O2 and others owned overseas - the UK businesses now generate less revenue for the owners.
If there's no workable deal on data privacy standards with the EU then a lot of UK datacentres are going to struggle as any app or service holding data on EU citizens will need to move.