Do you know the name of it, if so you can look it up or put the name on here and someone may know whether or not it's hardy

hi there no name on these!! thats the problem

This isn't one I recognise as being hardy, so I'd treat as half hardy. Which means frost free conditions to ensure survival, so either place in a cool room in the house and water as little as possible, or bubblewrap the pot, fleece over the top and stand in your plastic greenhouse. Slightly worried because parts of Kent get very cold indeed in bad winters...

If you haven't got the space to over winter it as it is (as it looks quite large) why not take cuttings which means you only have to find the space for one or two small pots.

Sheila, I'm not sure that isn't a standard, it looks big enough, and if it is, it will need to be moved somewhere frost free to keep its growth that way.
Ladygardener, can I just clarify - when I say move to a cool room, I mean a room cool enough for the plant to drop its leaves - you don't want it continuing to grow and flower over winter, you want it to rest - but not to die. So water sparingly, maybe a little once a month, and an unheated room would be ideal.

oh thank you so much that is so so helpful think I will take it to my mums