Pubs really should have been one of the last places to reopen. But you could also argue that the take away pint situation we have here is even worse.

I don't think there will be a huge spike after this weekend though. I'd imagine that most of the people flocking to the pubs haven't been particularly observant of lockdown anyway. The real danger is in a few weeks when it all becomes a bit more 'normalised', and people who were being sensible start mixing in groups in pubs.
For anyone who has been shielding or trying to keep contact to a minimum, I'd say that the next 4/5 weeks are time to double down not ease up. Over the next few weeks that dreaded 'herd immunity' may well start to be built up