For those of you that want to spend some time and create the joined maps yourself, some additional information:

The GB Discoverer 50k map already contains the autorouting layer (67 separate maps) and the overview_mdr.img (search index), so the Park- and Trailmap won't need these files. Actually you only need one img from each 25k map!

- The National Park maps v3 have FID=2543
- The National Park maps v2 have FID=400
- The Trailmaps v2 have FID=400
- There is only one Trailmap v3 (Coast to Coast) but at the time I created my maps this one didn't exist.

All 25k National Park maps joined in one img:
Code:
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All 25k Trail maps joined in one img:
Code:
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* All extractions and joins were made with GMapTool offcourse