This might be a stupid question and I will ask our plumber but I'd rather you lot told me it was a stupid question than the plumber 
if we have a pump installed for our new shower in the en suite can it be used for a second shower in the bathroom or would we then need a second pump?
Also, is it likely to be a problem if it's in the loft. I'm thinking in case it freezes as it can't be insulated?