They can't go to Peterlee - they have to go to Deptford for maintenance, repair et cetera! There was a "Venture" branded MPD on Chester Road on 'road testing'... I think it's quite possible that if it came from Stanley and "ventured" to Sunderland, it possibly managed to do more mileage in one morning than it has done in the past month on "Venture" services! (Okay, bit of an exaggeration)...
Didn't manage to spot either of those two allocations while at Jarrow or South Shields though! I spotted 3972 on the 27 at Jarrow though.
I shall update this post with the irregularities of the day I spotted accordingly when I've managed to upload all of those items to Flickr!
RE: Go North East