As soon as I'd parked the head honcho came over with a mechanic. Both were their usual friendly and approachable selves.
Good start

They asked a few questions....oil/fuel consumption? Poor to both. What type of driving do I do? Sitting down with hands on steering wheel

They then checked out the breather pipe from oil tower to carb (not collasped). All the airways in filter box and top of carb for excessive oil. None. Just as Laurie said for me to do on here...thanks again, Laurie. I'm learning a lot about T25's

Then they removed all sparkplugs and did a compression test on all barrels twice over for average readings and removed themselves to the office while I waited with with a free coffee. Couple of minutes passed and Head Honcho says that in fact both banks are down on compression!

I personally am happy with my treatment so far and I feel quite confident these guys are offering a truly good service. Afterall, these things can happen (but why always to me?!).
Luckily, I'm in a strong position. I got them to do the 500 miler oil and filter change. I also got them to remove, refurbish and set up the carb correctly. And all waterways, pipes, etc that didn't come with the recon unit were also replaced by them. So it's down to them to give customer satisfaction.
So, under warranty, they intend to drop engine and replace pistons, rings and liners. All booked for next Monday. Have I missed anthing?
If not, stay tuned (pun) for the next instalment.
Thanks