Back to the op:

Bought a pack of sorry looking Cyclamen 'silver mixed' from Homebase a
month or so ago (felt sorry for them). *They have now perked up but I
don't know where to plant them.
Question: Are they hardy?

These have done the rounds in most of the sheds and garden centres.
It is the 'Silverado' strain derived mainly from Cyclamen persicum,
but there's also some hederifolium (I think) in its background, which
gives the foliage colour and slightly increased cold tolerance. I
have several outside that withstood last winter and the most recent
cold spates and are still flowering. Ideally they should be grown in
a frost free spot and brought on to a cool, bright windowsill indoors
for flowering. However mine took a couple of -5.7C hits and numerous
less severe sub-zero nights so you can read into that what you
will.