Blwyddyn Newydd Dda Cap,
Sounds as if you're having a big rationalisation effort, I had a Triumph Stag years ago, red blighter that worked when it wanted to - PCL246J. Sold it in pieces after heads warping for the second time.
I'm sorry that you're having to sell the holiday let, we would have liked to rent it from you at some time. Reason we didn't is beacause being fellow members it could be mis-construed as wanting a favour.
I've just found some slap in the propshaft in the 535i and am researching my options for repair or replacement, after that is going to be the brake booster re-build and I'm dicing with the idea of changing the head, the valve gear is noisy and I've got the one I bought from Duncan sitting on the shelf doing nothing.
Apart from that she's all back together but I did have to change the timing chain tensioner. I will be taking her over to my mot garage to take some pics of the prop shaft and take some measurements.
I sold the 740i last year, just sitting there getting older and older, so off it went!
Nice to catch up with you and kind regards to you and your family,