Malvern, you’ll like the open water, heated pools are awful places once you get used to being outside.
Avoid the speedo tri suits, they have a tri zip which can be undone quickly by pulling upwards as well as downwards…unfortunately as i found out early last april whilst swimming solo in the middle of a bay some distance from shore that zip can suddenly undo if you pull it a tad too far when putting it on. freezing water flooding your wetty and no way of doing it up until you reach dry land is a scary thing when out on your own…I was very grateful that I always swim with my chillswim towfloat and would advise anyone who swims open water to get one…
I still have the speedo suit but i have put in a tiewrap around the top of the zip so I cant pull it too far, but its an awful system.