Hi Gavin, I spent forever umming and ahhing, waiting for a perfect 2.2 to come along and none did. All there seemed to be were series 1 basket cases. I finally took the plunge on a 1979 504 at a classic auction three months ago.
It was billed as a car that had been kept sorn for 25 years as part of a collection but had been maintained and would be sold serviced and mot'd, it was also a nice colour and seemed from the pics to be in fairly good condition. At the auction it turned out it had failed the mot (hand brake, indicators and front suspension bits). The auction chap guesstimated £300 to sort it. I decided to bid for it and had a cut off of around £9,000 with a view that another £3000 for recommissioning would take me up to my limit.
I won the auction and the price with fees came just under 9k. It then cost £300 to get it trailered to a specialist Lotus garage, £300 for new tyres and £2000 to sort the mot fails. £650 for new fuel pump and sender inc labour, £350 for some rear belts and a bit more for other fettling. I was very lucky that that original chassis was in perfect condition without rust and so I got it waxoiled (£300) There's still the windscreen to replace due to a micro crack and I'll get the headlining sorted at the same time (maybe another £1000?)
All in, if nothing else fails mechanically or electrically, buying it (inc auction fees) and recommisiong it will have come to just under £14,500. I think this is a resonable price to pay for a seldom seem motor car and fair compared to todays prices for contemporary cars of its ilk.
I think if you pay the asking price and factor in you lack of diy skills (like me) then another £12,000 might see you with a fantasic looking and performing Elite 502, in you're choice of (original) colour with a brand new interior and sorted mechanics and to my mind worth the cost. If the chassis proves to be ok then I believe that would be realistic price to save another Elite form the scrap heap.
It sounds scary but it is just money after all. Once you've signed the direct debit form you can forget about the cost.
If you decided to go ahead though, make sure you've got a first rate sepicalist garage who know Lotus' and classic cars in general because they're going to become your new BFF's.
Good luck.