When it comes to hutches, spending a good amount of money for a decent, sturdy hutch is important. Buy cheap and you will regret it because they won’t stand up to a UK winter if you aren’t able to move it into a shed.
I know you said you had to rehome your boys but I’m not sure whether that happened or whether you’ve still got all your piggies but size wise if you’ve got the neutered boar/sow pair then you are looking for a 5ft hutch. If you’ve got two boars still then you need a 6ft hutch.
I personally prefer having a separate hutch and run rather than a hutch/run combo - I just find them easier to manage and be able to move the run around the lawn to refresh the grass
You have also got to consider the seasons.
Hutches can get very hot so need to be kept somewhere shaded in summer And kept a close eye on as they can still get hot.
In winter they need protection (ideally being moved into a shed or garage) including thermal and water proof hutch covers or tarps. Things like old carpet or blankets underneath a waterproof layer will also help keep warmth in. Lpads of hay for warmth and snugglesafe heat pads