In terms of percentage land cover, Surrey is the most wooded county in England with 22.4% or 37564 ha of the land under woodland cover (excluding woodlands under 2 ha).
There are two main influences that determine the type and amount of woodland in the county. The geology/soils and the influence of man.
The geology/soils not only influence the species you find but, depending on how fertile and workable the soil is, whether the land use is likely to be woodland or agriculture. Surrey does not have a large amount of good agricultural land, and therefore has a large amount of woodland.
The Surrey Woodland Study 2008 describes Surrey's woodlands today, has an analysis of the issues facing them, and action proposals to deal with the major issues.