Cheers guys and gals!
I now know what happened yesterday. What I believe was going wrong - wasn't! For the first time yesterday I was more relaxed and confident but not too confident. Consequently, I had a bit more time and started to concentrate a bit more on the PAPIS lights and being very critical of myself (that's my nature) I thought that I was ballsing it up when I probably wasn't.
Sometimes my approaches are a bit too high for sure. Today, my second touch and go ended up in a go-around but this was as a result of not extending the base leg enough so that as I turned onto final I didn't have enough room to descend sufficiently, thus ending up too high.
Basically, I'm expecting a perfect approach that a 747 Captain would make and obviously I'm not anywhere near that capable....
Sux to be me, huh?
Hersham Boy I'm referring to the PAPIS lights on 26L/26R coming in over the M23.

Hehe. Sorry mate, I had to get that one in.
So, as per your advice, everyone, I'm now not using the PAPIS as a "measuring stick" other than keeping half an eye on it in case it all goes red but I've gone back to my old way of just measuring the whole approach by eye/pitch/desent rate.
Once again, thanks for taking the time and trouble to help me out.
Regards, Sennadog.