been away a while, trying to connect and its saying "server out of date". Is my client "too new"?

minecraft.crazy-fools.co.uk:25565 <----

If you updated to 1.4 already then yes, your client it "too new".

vanilla server ip is
minecraft.crazy-fools.co.uk (it is 1.3 still though)
and tekkit is minecraft.crazy-fools.co.uk:25555