Update: Having seen RICH313's success in following Patrick's suggestion detailed above I decided to try it again in case I missed something. I did, I didn't change the scaling as well. This time I only changed the scaling, as per RICH313 example above, I went down to 175%, but still nothing changed. I was about to change the resolution as well and try again when the following, under 'Scale and Layout', caught my eye: "Some apps won't respond to scaling changes until you sign out". I signed out and back in again, ran the update and it worked. Hooray! Thanks Patrick - not a 'stupid' sounding suggestion at all, but bang on target, and thanks too, to all who posted - we got there in the end.