Sue Begg wrote:
[...]
They haven't worked either. A lot of plants have died because of
the
tunnelling through the roots and I am now at my wits end. All
suggestions gratefully received.

I sympathize. But in my own experience, moles don't seem keen on the
loose soil of established beds which are forked over regularly -- or
perhaps it's just that I've never noticed. If my guess is right (and
we'll soon enough be told if it isn't!), they may eventually get the
message and leave your flower-beds alone, though it will take them
time to give up old-established routes.

--
Mike.