Fotospeed do a couple of kits (available from SilverPrint, although you may find shipping to be excessive. Another source of chemicals would be Moersch - My German isn't very good, but it looks like he does cyanotype solutions.
Originally Posted by Steven L
As for Ammonium Dichromate, it can be substituted with Potassium Dichromate - Both are very toxic and can not be sent through the post (it is on the no-fly list). Unfortunately, this sort of stuff is getting difficult to purchase anywhere in the E.U. even through specialist suppliers.