First its important to establish quite what you mean by Calla lily - Calla palustris is the only real calla, and that's a bog plant. Other plants often called Calla are Zantedeschia or Arum - do you know which you have? If not, can you post a photograph?

Hi Bamboo
Thank you for your reply the ticket with the plant just says Calla Lily "Golden Nugget" and I have now added photo.
I appreciate your help Green 70

This is Zantedeschia 'Golden Nugget' - its not hardy in winter outside, so you'll need to put it somewhere frost free for winter, or let it die down and save the funny little cormy/bulby things it grows from.
Doesn't like to dry out, but doesn't want to be waterlogged either - I'd use a mix of John Innes No. 2 and multi purpose, or a good multi purpose compost.

Many thanks I will try that .Happy gardening.