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     Dear Bill Stevenson,
                        By "spatial data" and "collections" do you mean map
     libraries?  If old-fashioned paper maps, aerial photograph-  and
     satellite image-derived mapping is what you are after - in part or in
     toto - then you could start with IFLA's (out-of-date, admittedly)
     'World directory of map collections', the British Cartographic Society
     Map Curators' Group Publication No.4 'A directory of U.K. map
     collections', 3rd ed., compiled by Joan Chibnall (1995), and 'NAPLIB
     directory of aerial photographic collections in the United Kingdom',
     1st ed.(London: ASLIB, 1993).  Or - perhaps more significantly - you
     could talk to colleagues in the Royal Library (DK) Map Library and/or
     LIBER Map Curators' Group colleagues (e.g. Jan Smits, Royal Library,
     The Hague)...  Or are you after digital data/GIS?
     Yours sincerely
     Francis Herbert
     Curator of Maps, RGS, London
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