This seems to be an excellent price for this particular World Atlas. Ignoring ebay, Google shopping has the next best price as £16.13.
The Insight Family World Atlas offers a comprehensive introduction to the diversity of the planet with 200 pages of clear, up-to-date, detailed, digital mapping with vibrant use of colour to aid orientation. Specially developed pictorial system identifies over 17,000 sights and attractions. A 60-page country encyclopedia provides key information and statistics and is lavishly illustrated with more than 200 colour photographs. There are 80,000 index entries accompanied by pictorial symbols show at a glance, whether the entry is a place, a monument, a river, a mountain, etc. It is ideal for home study and general reference.