Just emailed them myself. Would love a few old Alton Maps, and somehow i don't trust Ebay 8-[
I've never had any success when contacting parks for old memorabilia, they never seem to keep enough of it to send out to people.
As for Ebay... I've spent well in excess of £200 over the last year or so on park memorabilia (Mainly Thorpe) and have never been scammed once. Trust me, the likelyhood of getting scammed on an item like park memorabilia is very low. Tricksters wouldn't bother selling something with such a limited audience.
If you want, PM me and I'll give you some names of some awesome sellers on Ebay, who I've, since starting on ebay, ended up trading with directly through paypal and email... they're very trustworthy!