Does this look like it needs to be replaced?

I know I should probably get a plumber to come and have a look - but just bought this townhouse and trying to minimise costs needed.

Shower is also very hard to get the right temperature too, and wondering if this could be causing it? It is also starting to slowly leak, and the outside tap is leaking slowly too.

Does this look like it needs replacing and would replacing help anything as well in the future?