Good grief - so much ignorance crammed into one post….
The EU hasn’t got a programme - the Commission is pushing for one. If it can get interest in, which I doubt, it is many years from being agreed, let alone built.
Since the UK isn’t in the EU it wouldn’t be invited to participate in the design, construction or operation of any such system, so why would it consider joining over already existing systems.
OneWeb is an existing company with a constellation going active this year. The UK is only one investor alongside several major international telecoms providers, including Eutelsat*. The constellation coverage is global.
The system is of interest because it can provide coverage in rural and other areas where fibre isn’t cost effective or viable.
The advantage of OneWeb over SpaceX, the only other current completion, is their business model. SpaceX sells its terminals directly to the public, OneWeb provides bandwidth to telecom providers - such as BT, Virgin, Vodaphone etc who can then produce their own terminals and do their own marketing, sales and pricing - several of whom are reported involved in talks.**
*
https://spacenews.com/eu-sees-confli...ent-in-oneweb/
https://insidegnss.com/uk-sees-a-way...-the-leo-door/
** https://www.ispreview.co.uk/index.ph...dband-fix.html