Transit Options in the UK?

I have a customer who's trying to decide whether to renew their existing transit contract or not for a POP they have in the UK and wondering what's good for transit options out there. Looking for: - Good peering/reachability to other networks (I've already started perusing the LINX peer list) - Decent BGP community set (at a minimum RTBH and local pref, obviously the richer the better) - v6 support - Own the last mile a bonus Can anyone offer any recommendations? Cheers, GTG