I'd like to thank the AFF "brains trust" for the advice.
1D on the way down this morning.........I like 1D, the screen was just the right distance, the leg room good, couldn't rain on my shoes and strides (as it did when I was in 1A a while ago) and service was superb (thanks to the very professional cabin steward Kim. He made for interesting conversation, coupled with impeccable service without being over-bearing).
I'm trying 2D on the way home although if I do indeed get one of the BSI-800 J seats, it won't really be a comparison (but I'll suffer it anyway without gripe).
On a further note, whilst boarding was underway this morning, Kim asked, then served me a coffee pre take-off. Is this the norm for PE? It was very much appreciated as I can't remember the last time I had a pre-flight drink offered.