UK Dom is all in the Economy Config so seats are 3x3.
Try and get as far forward as you can because if you sit in a Convertibe Seat (Which changes the config to 2x3 in Club Europe) these seats have 34 inches of pitch as opposed to 31.
I always try to get front row using OLCI.
I think the convertibe seats go back to about row 14 so you may want to change that for the return flight.
The seat row before the exit on a A319 (Row 8 I think) has no recline - similar on a A320 but can't remember the row.