Iain William Wiseman wrote:
Thanks for answering,

Iain


Here is a dissenting opinion, kind of.

I think it depends on what makes up the beer kit. Some of the
ingredients may be stale. If it contains liquid malt extract there is a
good chance it's stale, especially if it's not canned LME. If there are
any real hops in the kit, they too may be stale unless they have been
stored correctly. Any pre-crushed grains, likewise. The yeast may be
dead.

It will still make beer but may have some off flavors.

Andy