The senator does look good.especially in that colour.mind you I think all large cars look good in dark green !.they always seem to have the rear wheel arch rust issue and were also badly prone to front chassis leg tops going through ,something the earlier 78-86 models seemed to avoid .looks a good example and should hopefully fetch a good price.the insignia is also climbing.at £2500 now
Indeed, everyone of them. Mine started to have that back in the day, and in about 1997 I asked how much it would be to deal with the problem: £1,000 each quarter panel was the answer. I then went to the Omega's. The pictures seem to avoid a full shot of the arches, but one does appear to indicate the dreaded problem 
I also note a lot of work has been done on it, but I would be troubled by:
" September 2008 Webasto Thermo Top P engine pre heater fitted, operated by remote control. Running off petrol, this heats the engine coolant which in turn heats the engine. This is a brilliant bit of kit, especially in winter. The engine has never had a cold start since. Air condition pump and all pipe work has been removed to accommodate the engine pre heater."
What is that all about? I would sooner have the air con! 
It's a coolant heater, designed to heat the coolant so that the engine isn't started cold thus reducing wear. Many diesels have them as they are more efficient than petrol thus less "waste heat" to warm the cabin. In cold climates they are often fitted with timers allowing them to operate, as this one, and warm the car prior to driving off.
Many ABS owners have a variant to this which is a Kenlowe "Hotstart". This is an electrically driven heater/pump connected into the coolant circuit - it does the same but requires a mains supply to work. The Kenlowe takes about 45 mins to warm a V6 Omega engine to normal temp. I fitted one to my MV6 some years ago & they work well enough.
The Webasto units are fuel (petrol or diesel) powered. I don't have any experience of them personally as an engine heater with timer, but Ford fit them as standard to diesel Mondeos - warm air from the heater within about 20 seconds of a cold start.
Hope that all makes sense .......
