Oh my, only finding this after writing an answer to the first part. Ok, the Steem wallet was split off from the blog site and there now are several different front ends, Steemit being one of them, but now there is also Steempeak, Palnet and Partiko. I haven't really explored any of these yet, but I do have a login for Palnet on the insistence from Lynds'. Yes there are different tokens for some of these, but I haven't really explored what they can do or how that all works.

What would you like to do with your Steem? You can power it up so your votes and curation rewards are higher. Once you have more than 500 SP you can also delegate your SP to help others with less than 50SP so they can post more. To cash out I convert to Litecoin and use that Wallet to send it to a local exchange who will then deposit it directly into my bank account after conversion to Euros. It seems you have completely ignored the Steem aspect of Steemit, no matter, there is plenty of help.

In the Netherlands there are several local exchanges, but I don't know if they cater to the UK. I'm sure there have to be a few in/around London.