Thanks for that Mick. I have run out of space at home for many reasons. So its loft or outside. Ive been clever and got my grand son to 'demand' a train set which we have but he wants more and so its 'where?'. Im currently lifting a small 5' by 4' in and out of the garage when he comes.
Outside seems best. However, I did consider what problems with electrics there would be outdoors and so thats why I came here. Your comments are extremely helpful.
I will have to think the options through again. Maybe its up to a tricky loft.
Jim