Sooooooooo - Due to a "sudden demand in the GTE engine" the cost of the engine has risen to $6900.00 ( £5000.00) delivered to the UK. If I have calculated the tax right you need to add on 30% so the engine would be £6500.00
So there we go - I'll suggest that was an exciting ride, but that's where we've landed.
Although they would sell W58 boxes for $570.00 (£413.00 + 30%) - random discovery.
They would offer discounts for orders over 10 items, but unless I had been able to order one first to check they were legit I wouldn't want to sort a group buy in case it is in fact, all a complete scam. I don't think it is, I just think they've realised they can charge me more...
I'll update if I get any further with this route, and apologies if I've wasted your reading time.