Happy to report that the pdf bought from UK Planning Maps passed validation by ###### District Council yesterday. The online markup for the site boundary worked OK for me after a bit of practice despite what one of the reviews says. The hard copies turned up from Kirkwall 48 hours later, not really necessary but bought as an insurance, printed on good stiff paper and not creased in transit. I edited the file to add the proposed heat pump (a tiny rectangle 3 x 9 pixels!) using IrfanView, which is a free download, to convert to .bmp and using MS Paint to edit, then the reverse. Some advice on the website on how to do this would be helpful. Conclusion: does what it says on the tin!