WSX have just installed permanent courses in three of their local parks - Littledown in Bournemouth, Upton Country Park near Poole and in Poole Park itself where the existing course has been updated. This has all been done with Lottery funding.
What is particularly useful for local schools is that because these parks are council owned,Wessex have been able to put up the maps as downloadable files on their website so you can print your own maps on demand rather than having to buy them from the park itself when the park cafe/shop is open.
(WIM can't do the same for Moors Valley because of Ordnance Survey/Forestry Commission licensing conditions - but it is much easier to get maps from the Moors Valley Visitor Centre (where they get through an incredible 1000 map packs per year) which is open daily throughout the year, unlike the park shops.)
Together with basic instructional leaflets for each of the parks and a couple of other leaflets the whole is an attractive package and well worth investigating.