OK thanks again guys, I thought I would report back, I have installed my new RAM, the first time I turned it on there was no improvement whatsoever, in fact some things were definitely slower than before but having used it for a couple of hours and opened this or that at various times over the last day or so and done the odd restart it seems to have settled down and speeded up - is that normal?
I did some times before and after as follows:
Open from shutdown: before 40s, after 18s
Open web browser (Firefox) with the same 10 tabs open: before 17s, after 17s
Open file explorer: before 3.5s, after 3s
Open a doc file from explorer in WPS Writer: before 22s, after 7s
After it is up and running if I was to say shut down the browser or Adobe and then reopen it, it is almost instantaneous, whilst I did not measure the times for these actions before this is definitely a lot quicker now. Overall it just seems a lot quicker switching between programmers and having several apps open at once, before it was sluggish and generally a bit of a PITA but it seems a lot more user friendly now.
I'll look at upgrading to an SSD so will no doubt be posting back after some googling.