TBH I think that there has been a lot of talking-up of prices...
...also you are in bloody Wales (!) :-) Which as we know is a long way from no-where, you have to bloody pay to get in, and is full of Welsh people!
In my opinion I would put your interior back to stock as much as possible interior - with dash, seats (sell them), shift and cluster... get it well serviced (not by yourself - but someone known - no offence but it is a lot of money!). Engine is great so just leave.
If you want it moving to London to sell you are welcome to use my drive!
Cheers
(Jurgen is good idea btw - but he is near Shetland Isles! :-))