I'm sure Geordie H will be along shortly to give you the exact details. Thursday evenings and Sunday afternoons when there is a comp on are probably your best times, membership is somehting like £30 for the year and runs up to December 31st so you have to ask is it worth it for less than three months fishing.
Now if only Seaham club did part year memberships, I'd certainly consider paying half fees to cover the last four (now three) months of the year then they'd likely have a guaranteed renewal in January...