The web site gives general information and some useful links. Once a rival to the Ordnance Survey this company now sells a smaller range of maps since becoming part of HarperCollins. However, they do have British, European and World maps on CD ROM and digital datasets suitable for GIS applications. This is an American company based in North Carolina which sell maps on-line. Their web site has an excellent catalogue of current worldwide topographic and travel mapping.
Considerations regarding purchasing by credit card on-line also apply.
The telephone sales desk is helpful and maps can be purchased directly. Latest publication details are in the Map Room. This company offers a comprehensive service for the supply of geological maps from agencies around the world. There is a web site which is progressing but not yet complete. Indexes for all OS historic mapping are kept in the ENV map room.