Andy - got 66k currently in stock but its a single lambda TAPE car, although they come without manifolds anyway based on you using yours - that would make it a twin lambda but you'll need your manifold and a new gasket for it. £330 for that delivered and available ready to go.
There's a 55k going through next week which I was going to bid on, that's another 52 plate so it'll be a twin lambda DIVE car. Engine would be £365 delivered but would be 13th/14th earliest by the time its been delivered to me, removed and palletted up.
Unless you're very fussed about the mileage then I'm fairly sure there's no reason to constrain yourself to a twin lambda donor although it might be worth getting that up in a thread to check. I don't see why you'd need to if you kept your manifold.
Is there anything salvageable off the old engine? That would get you some money back also.
Mandy - no worries, always a pleasure