Do you mean the APC models? Some do and some don't have the UK plug.
This one (http://www.misco.co.uk/applications/SearchTools/item-details.asp?EdpNo=396721&Sku=163302)
for example has the UK plug. Others don't.
I am sure you can find a solid UPS (certainly doesn't have to be APC brand) here. Happy shopping!!!
BTW, how did you come up with the 1500VA requirement? How many PCs/devices do you plan to connect to this UPS?