Hi, thanks for all the advice, especially the fish list. To answer some replies. they are in the same vivaruim, not seeen any breeding behaviour but recently stumpy (has lost the tip of its tail) has beeen more active, very interested in things & a lot less skitish. Actually came up to me when i had the vivarium door open & came up my arm. Spikey (not lost its tail!) is still active but still hides when i open the viv. Looks out of the hide though. I don't know the age or sex as the pet shop didn't. they were labled as "Northen" Garter snakes. I'll have to dig my old books out & check this out.
Interestingly lance fish aren't on the either safe or unsafe list, for some reason i've been labled as living in the states when i'm in the UK, are these called something different in the US?. At least the Mackeral will be the right sort.