If you go to the Hymer web site
Hymer Web Site
And click on the english flag and go to the contact links, they are differant departments there now but i suppose head office would be the best bet.
If you request an english manual they should send you one, just tell them your Hymer serial number, your name and address.
I got one from them last september, i offered to pay, but i got no email reply, just a photocopied manual in the post about a week later.