If you're after broadband (and maybe phone) then check out smaller suppliers like Aquiss, uno, IDNet, CIX, AAISP, Zen Internet - several have had free connection offers, so in my case I got a brand new FTTP connection installed for no charge, when leaving VM after over 25 years.
Even if you've got an Openreach copper line, it seems there comes a point where they deem it no longer active, and (apart from free connection offers) you'll pay a standard new connection charge even if it's using the old line.