Fuchsia denticulata is it Hardy

In a word, no. It comes from South America and needs to be overwintered in frost free conditions

Hi Sangral and welcome to GOY. As far as I'm aware, this fuschia is best considered half-hardy and so would need some protection from frost. A frost-free greenhouse or conservatory would do the trick, I think, but I'd be very wary of just leaving it outside. You don't say where you are in the UK but you *might* get away with it in the far south with a reducing chance of winter survival as you go north.
Hope this helps ...

Oops - simul-post there, Andrewr!

Well at least we agree Peteg :-)

I just bought Denticulata fuchsia this afternoon from our local nursery who sells a lot of fuchsias and tag doe ssay Hardy ,but would think depends on your area.

No it isn't. I also thought it was - I had a nice big strong plant so I just left it in the garden, but Monday nights frost appears to have killed it :( . Will update this again in spring, should it miraculously recover... I am in South Essex, so further north you'd have no chance. The other hardy fuschias made it through - i.e. Delta Sarah, Army Nurse, Hawkeshead etc, but Denticulata is all wilted.

And mine has been in a heated greenhouse through winter and still has not come through the winter.

Maybe I should have wrapped it newspaper stuck it in a box and put up in loft.

most fuchsias that are labled hardy have only been tested for hardiness in certain areas of the country. It does not mean that they are hardy everywhere. the test is that they survive so many winters outside(I can't remember if it is three or five years). but plants tested in say essex may not be hardy in say yorkshire where the winters are hardy. I think the British Fuchsia society can tell you where most varieties have been tested. the best way to know which varieties are hardy in your area is to observe which varieties other gardeners in your are grow.