I took the advise given, thanks Dove.
My tree grew about 1/2 ft last year and was potted up in a mix of home grown compost and multi purpose compost, it was fed on liquid seaweed occassionally throughout the summer and kept by the house so wasn't exposed to too much sun and didn't dry out but had good light. It looked really healthy and still does.
Mine's still indoors, was going to put it out today but the weather was cold,wet and windy. I potted up last year into a clay pot, it was so heavy bringing indoors this time would advise a plastic pot and burying the pot in the garden,if you have the space,to reduce watering, the tree will take up water then,from the bed it's planted in.
I waited till March to pot up last year, will do the same this year but replant into a plastic pot the same size and scoop out compost from the sides and any loose compost round the roots, adding fresh stuff to give the tree some nutrients, primarily because I don't want it growing too tall and if potted up into a bigger pot it willl get taller.
Hope this is helpful..happy gardening...