I have been able to keep it some winters by putting it in a frost free shed. I don't think it would survive outside in this country.

It is a perennial - but not in the UK, here its treated as an annual, it needs a warmer climate to behave as a perennial, which is why you're getting conflicting information. This is true of quite a few plants like tender fuchsia, pelargoniums, marguerite daisy - all may survive if given shelter over winter in the UK, but are unlikely to survive outdoors over winter.

I agree, we treat it as an annual here. But another year you could try keeping it in a greenhouse (or somewhere frost-free) and it might survive if you’re lucky.

Thank you everyone....I'll dig it out then 'cos definitely not been protected. There are bulbs coming through it now anyway.