thanks!

but by PADI open water i meant scuba. and yeah, im thinking about doing aida with saltfree divers.
just out of curiosity... what equipment would i need to rent from dive center? fins/mask i have... wetsuit... not really interested in diving so much (only while on holidays, couple weeks a year) to think i require it...
basically i guess my question is... on my own i can get about 10m deep and almost 40m in swimming pool (and so far i am happy with about half that to keep it safe), im mostly snorkeling, and going down only i see something fun. unfortunately living in london i would get to dive couple times a year so i dont believe ill make much deeper than that without a lot of practice...if doing scuba certificate would let me do "normal" open water guided dives, instead of a single "discover scuba", is there a point to spend 400£ for an AIDA 2* certificate if i basically can do almost all the same on my own?
and yeah, i have heard all about not diving alone and know a lot of theory from youtube, but again.. diving 2-3 weeks a year, getting diving buddies would be not really possible... and regards actual practice... whatever practial skills id get, id forget all of them till next time i get to dive..