You could try the RSPCA they may check that the dogs have food, water and shelter, but cannot do much else by law.
Are they howling at night?
Someone is probably going in to feed and water them, but I would get either the RSPCA or your local Dog Warden (get in touch through the Environmental Health Dept. at the local council offices) to check on them. But I would do this first thing tomorrow as after that you will not get alot of joy out of anyone!
The dogs will probably be fine, after all if you put your dogs into Boarding Kennels over this period they would be outside all day and only have a heat lamp at night! If they have each other and blankets in the beds they will be OK.
Good on you for caring though!