Ditto what Hughsey said for yourself. If you can rig up light on a pole it will make feeding & bedding up on dark days easier ( we have a cheap light from B&Q on an extension cable to the garage for one of our far flung paddocks)
For the pigs as long as they have a dry bed they will be fine, pull out any damp muddy bedding and use it to make a straw doormat outside their house and refresh with dry straw daily if necessary(use your bare hand to test for dampness), in very bad weather they can be fed on the doormat in troughs or trugs or washing up bowls to stop them churning up more mud as they forage for food fed on the ground.
If i remember rightly you keep a small breed of pig so they don't want to be upto their bellies in it making the doormat will help them have somewhere to keep out of it.
HTH
Mandy