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I thank both respondents above. Multimap is no use because their photo search defaults to getmapping and (see my original spiel) do not cover the area in question (there are big tracts of the UK outside their coverage to date). Amateur photos would not do because I want a good definition print taken vertically, not just out of the window using an ordinary camera - this is done using special cameras, often looking through the floor of the aircraft or else mounted on a jig in a pod outside it. These sorts of views are readily available abroad, including in many countries where they are to be seen at the receptions of local police, fire station, council offices, etc. Apart from cost, they are no more difficult to get hold of than, say, a spare copy of the telephone diractory. This country has not quite caught up yet. Any advice regarding a search is welcome.