Our Academy Trust decided that on return from half-term they would be eliminating bubbles and going back to general mixing of the school population for lessons etc.
Their reasoning is that they want to be able to use all of the specialist classrooms (which they were already doing for some subjects), and they hadn't anticipated 'bubbles' having to be in place for more than a term 
I would really just like to see how common this is?
FWIW we're in a Midlands town that was in (pre-lockdown) Tier 2, bordering two Tier three cities, one of which is home to most of the teaching staff.