Thanks for the feedback.
The driver in question won't load on my machine, says it's not suitable.
In Device Manager if I click update drivers and select Auto Search it comes back telling me my drivers are up-to-date so not convinced this is my issue.
I also ran Intel Update Manager and it also came back saying there were no new updates for my machine.
Interestingly there are a couple of Fan Missions for Thief2 that I get the same problem with, never knew why.
Could it be OpenGL version? If so where can I see that?