I did try a left-field fix this morning by pushing all of the game graphics settings to Ultra which apparently can ease the wait times to shift data from the CPU and GPU as the GPU supposedly is working harder to process more data…no joy, the game does still does judder every 2 seconds but I have to admit the UK photometry looks amazing. Obviously 60fps is not going to happen on my system but I was impressed that it did work ok: I flew into London City to test this half expecting to be able to fry an egg on the top of my system unit as it attempted to render Canary Wharf!
So, now to alter the pagefile settings so will try the suggested fix…