Masters swimming in London and Dublin

Hello-- I will be vacationing for 2 weeks in both London, England and Dublin, Ireland leaving in 2 weeks and would like to swim at least a few times while I am away. I'm not sure what kinds of programs they have like masters swimming, but it would be great to drop into a program in either/both cities a few times. I know I've seen posts on here from swimmers in at least London.... * For London, I'll be staying at the Hilton Tower Bridge, on the south side of the Thames, between the London and Tower bridges. * In Dublin, I'll be at the Conrad, just across the street from St Stephen's Green. I've done a little online research, but thought I'd see if anyone on here has actually gone through and experienced it first-hand. I also plan to ask at the hotels in both cities. Are there any special quirks I should know about before I go? For example, at one pool I went to in Tokyo, everyone had to wear a cap. I'm not a cap person, but wore one for the sake of swimming. They also nearly freaked out when I got out my paddles for drill work. From what I gather, they swim clockwise when circling, so opposite what we do here in the US. I'd appreciate any input on pools and masters programs in both cities. Thanks! Tim