Hiya widowmaker
I had a lousy machine (or grafics card anyway) and I was using exactly this portion of the route and gradually (trying!!) to build it up. The only bit that caused any "stutter" was Bristol itself, but then as I said, I had a lousy card. Memory, I only have 784Mb atm but will be upgrading. The Gfx I have upgraded to a decent "mid-range" and am dying to test it out but I have to do a re-install on Monday.
I personally love this route as I used to live in the area for quite some time so I'd say release the 4 parts as one.
Great route and thank you for this
Chris