Ollie I'm sure you understood my comments were in Jest
TBH £400-£500 would be about right for a two day detail, that would cover full wash, interior etc but if its just the paint work correction needed then i should aim for significantly less.
This isn't a sales pitch as your not even in my catchment area but Polished Bliss recently did a two day detail of a silver csl and the machine polishing part only took them 6 hours. Yet with the interior, wash, clay etc wax it all added the remaining time.
FWIW I have just quoted over £400 for a two day paintwork only detail of an Audi A8. This is much larger and much harder paint.
HTH