That troublesome low looks like it may spoil things at the weekend, but on the plus side Thursday and Friday look good for the majority of the UK with just a few showers around. GFS 6z shows a max of 22c in the south on Friday which is not to be sniffed at.
Then it gets complicated with low pressure, having affected the UK at the start of the week, coming back again to affect the eastern half of the UK for the weekend. How close it gets to the UK is still undecided but the eastern half of the UK always fairs worse in this situation. The best of the dry and sunny weather across southwestern England.
The 6z so far is making much less of the weekends low pressure so things are no set in stone just yet.
By Sunday its a little closer but notice all the warm air just to the east of the UK.
By Monday the low has all but vanished and high pressure takes over.