Brittania at Darlington is definitely Tuesday.
Warning! The Colpitts is on Thursday but no longer at the Colpitts. Due to Sam Smith's Brewery policy of banning all fun from their pubs it has relocated to the Grange Foundry in Gilesgate Moor (just on the edge of Durham, facing Hartlepool!)
Hartlepool is at the Tap and Spile. It's just that it hasn't been called that for about 10 years - ask for the Causeway on Stranton Green. You'd be very welcome, the more so since we're going through a low-numbers spell just at the moment.