Just buy a UK road atlas once you get there. They are inexpensive and are sold in every book shop, n

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Just buy a UK road atlas once you get there. They are inexpensive and are sold in every book shop, news agent, and many garages/petrol stations. They are large enough scale that you don't need any additional specialized maps. One or another edition will be on special offer so you'll only spend a few .
If you want ordinance survey maps for walking/hiking - that's different -- but for driving any road atlas in the 3 to 4 miles to the inch range will be fine. One atlas will cover your entire itinerary.
Before you buy a road atlas check what scale they use for the places you intend to visit. Some publishers use a smaller scale for parts of Scotland away from the central belt, and they sometimes last minute travel deals leaving on christmas do crazy things with the islands to make them fit the page. Also check the date. You can often buy an atlas that's two or three years old at very low cost but beware of anything much older than this.
I've had maybe 20 different atlases over the years and none used varying scales (except for the city centre insets in the back). Maybe I've just been lucky, but they've been by different publishers so I wouldn't think that's a common practice.
But yes -- to fit in the islands, they are sometimes stuck in weird places. Still easy to follow - but the route from Portree to Mallaig to Fionnphort might span the corners of three different pages.