Hi Simon,
The TDdi was sold here as a 90Bhp, but also available as a 75Bhp in Europe I think.
Only due to tax/eco reasons. 75 and 90 bhp are the same unit and only need ecu update.
Our first Focus was an 03 TDdi, the addition of Bluefin (Google it
) saw it at 125BHp all via the diagnostic port.
TDDI can be upgraded to 105-110bhp. Have not seen any TDDI above 110 only upgraded using chip. Safe mods on TDCI can give you 125-130 bhp. Other thing is the turbo (waste gate), but it reduces the engine life.
MKII with a 2.0 TDCI PSA can be easy upgraded to 150bhp, which together with 6 speed gearbox gives a lot of fun.
Good luck with the sale
I bought one Focus obout a year ago, just to know the “enemy” and stayed with, so you never know

. TDDI can do 600miles from 50l tank, and has got much more space comparing to Vectra. It’s bit smaller than Omega, but for my family it’s even better (more headroom space, more space from boot floor to load cover).
And few technical bits:
There’s not subframe in Focus. All you have to do is remove the front (bumper, radiator), few other bits (4 bolts to exhaust pipe, accessible from the top of the engine). It takes max 2h to do it and then you can pull the engine with the gearbox (front bar is bolted not welded). Engine is installed on 2 mountings and it’s really easy to remove. Bonnet doesn’t have to be removed either.
Simon – can you please let us know what’s the mileage of your car. I had to replace one engine in 95k Focus diesel but just because someone was driving it with bent oil sump and oil light on. Diesels can do a minimum of 300k (TDCI will do less) if you service them correctly.
If you leave old diesel pump, it does not have to be programmed.
Cambelt is really easy, unless the camshaft pulley is not removed (there is no lock) and it need locking tools. Cambelt last for...100k (if a genuine Ford part)