yasnippet - snippet ordering

[Gary]

I'd ask on the official yasnippet group, but it seems to be a closed
(i.e. must use a google a/c to post), so I hope someone here might be
able to give me a clue since I'm sure there must be may yasnippet users.

Currently when I am offered snippet alternatives they are offered in
what to me are the "wrong" order, for example using a coding style
conflicting with the way I format my code (gnus vs bsd, for example). Is
there any way to specify which order they should be offered, or even
better suppressing some snippets?

--
Gary