Any tips on removing a SRAM GXP pressfit bottom bracket please? Video link would be stunning.

Large blunt object and a hammer , just tap it out a little at a time to try and keep it coming out square.
Might be a vid on park tools site as they make a proper tool

I’ve tapped out the metal ring but the plastic sleeve remains. Cue the innuendo gags.

There bottom bracket appears quite rare as there is very little guidance online.

http://www.pinkbike.com/news/Tech-Tuesday-Overhaul-a-BB30-Bottom-bracket-2012.html

I have the headset one as mentioned above, the better one is the one in the pink bike guide.