So, a bit of an update.
Brakes sort of freed off.
Cambelt and tensioner replaced.
Random wires checked, reconnected, etc.
Sub and amp disconnected - head unit kept by po.
Old V5 found.
History / reciepts found, filed.
Show spec sheet found. Handy.
Fluids checked - ok. Obviously due a change, but no emulsification or swarf etc.
Fuel tank removed. Ah.
Free advice - store vehicles with a full tank.
Fuel pump seized. Tank surafce rusty. Sender rusty.
Obtain spi tank, sender and pump assm.
No key for shonky fuel cap.
Use previously gained knowledge to effect removal with no panel damage.
Apply fuel. No leaks.