Update... I've started the car and run it for a while, and according to the pressure gauge in the car the oil pressure goes up to 4bar and then settles down to around 2 when the engine gets warm. Theres no signs of mayo or major engine damage at the moment. I've only had the engine running for half an hour or so but things are looking promising so far.
I've just got to change oil and water (again) then re-attach the front bumper and I'll be putting it in for an MOT. We've done a quick pre-MOT check on it and I'm quite confident it will pass. With any luck it will be back on the road in 2 weeks.... I've also sorted the wipers and fitted the fuel sender I got from Clee last year

Chris