You are in absolutely the right place, the dungeon.
Peeing while getting fucked is a bonus around these parts and you should not worry about distinctions between light and heavy SM.
What is light to me, may be hard for others, and vice versa. Never use other people's scales to quantify something that shouldn't be quantified in the first place. You enjoy what you enjoy, and that is that. No light or hard about it.
There is enough variety out there to acomodate you and all others, don't worry!
As for packing, check out the Vault too, a lot of packing conversations going on there, from where to buy to how to wear. Check old threads as well as recent ones. Do a search, I am sure lots will show up!

If you are looking for play partners, go for the usual, tell people what you like and hope they are honest in return, between Klub Fukk, Hard ON and Surrender there is a few places to go to in London to check out the other scene participants.
Also, SM Dykes Conference in Manchester in May, and before that SM dykes conference in Berlin at easter.

They are fabulous and great for begginers with their mix of workshops, ice breakers, socials and play parties!!