Weschenfelder is good (as per Sally's post) I also use Tongmaster
http://www.tongmaster.co.uk/ Joe who owns it used to be a butcher and is really helpful if you're a bit stuck. They do small packs and big packs of pretty much everything you'll need so you can try out a few and see what you like best
If you don't fancy pre-made seasoning mixes, just buy rusk and add your own flavours - honey and mustard, sweet chilli sauce, caramalised onion etc remembering to add iced water to the mix. This way you can get them exactly how you want them
HTH
Karen