> I wonder if EU would let UK join without adopting the Euro. The UK seems to have lost a lot of its negotiating power that let them keep the GBP the first time.

If the UK rejoined (assuming it was welcome after the last few years) I find myself wondering if forcing us (I'm British) to go all the way - into the Euro and onwards to full participation in everything - might actually be a good idea.

There are some aspects which taken in isolation may not be that great an idea (eg a Euro which includes such a variety of economies), but contrast that with the last approx half century where we've been the wall-fly. The one who goes to the dance, but hangs around the edges and never really joins in.

Half-hearted commitment can often be worse than none at all, and being forced to commit fully in order to be able to rejoin may well be the making of a better UK that takes it seriously and helps drive things forward.

Possibly.

What the UK had before was pretty much "EU membership the good parts" - and (a slim majority of) the public rejected that. Is full membership really possible?

That was a slim majority of who voted at the time. Leave voters heavily skewed older. Even just taking out the people who have died since the vote would result in a remain vote. 15 years worth of younger voters would overwhelmingly vote for remain.

Unless they change their minds in the meantime.

Half the countries in the EU don't use the Euro. Many economists recommend against a currency union without possibility of fiscal transfers to deal with asymmetric shocks, predicting what happened in the years after 2008.