Did you see the episode of wheeler dealers when they did a Bentley?
If by 'did', you mean 'mackled up beyond belief', then yeah
Last time that car came up for sale, the then-owner gave the full story - the show spent far more than they claimed, sold it at a loss, during the painting they had to replace the dash as they melted the original in the oven, it had a bloody big patch of filler in the back passenger-side arch, and he'd spent £400 putting that 'restored' car through the previous MOT.
Just how serviceable was the car before all of the work you put in?
The stuff that was needed to make it truly usable was getting the drivers seat control module working, bottom ball-joint on one side, a top-up of LHM and a vacuum pipe in the engine. Everything else has been about making it pretty again - the leather, the wood, the body and paint, rubber seals, etc.
I've really fallen in love with some of the old Sprints/Spurs/Mulssanes/Turbo Rs at work and am starting to talk myself into saving up and buying one as my next car.
You know that hoary old cliché about how if you can afford two of a car you can afford to run one?
To be honest, they aren't as bad as all that. The biggest problem is when you have work done by a shop - people look at, assume you're moneyed, and double their prices. We've been lucky with some local outfits when we've had to call on them, but others want to charge the Earth or simply refuse to have anything to do with it (even though at the end of the day it's probably less complex than the nearly-new Audi they've got parked in the workshop....go figure).
If you're serious about having a Bentley, save up for a Turbo R. Motronic rather than K-Jet fuel injection from '87 (the Mulsannes didn't get Motronic until 1990), Panhard rod at the back, stiffer anti-roll bars front and back, firmer dampers and springs. If you want the R-R, get one with the best brightwork you can find, even if it means having to do work on the car in other areas, because replacing trim on one of those can bankrupt you!
As always, if there is anything you think I can help with get in contact. If I can't help I'm sure I know someone who can
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Know anything about the cruise control on the '89 model? That's the next job after we reassemble the car - get that thing working.