First the hiss of the ink and roller!
Cutting a window in a piece of newsprint to a size 200 x 300mm to fit inside a standard 300 x 400 mm frame, I was able to float it over the image on the block to find a suitable composition. Then it was a case of carefully marking out the lay of the paper and attaching the mask by one edge so it could be folded back whilst the block was inked before being laid back over the block and the printing paper positioned over that (if that makes sense).
After running-up the ink it's worked rather well and opens up the possibility of picking other areas in the future.
There's an edition of 12 prints now just drying off nicely.