Well firstly there would need to be space on the course you wanted to transfer onto, which there's no guarantee of. Whether or not it would then be allowed would be up to the staff in your department, and if applicable, the staff in the new department you'd be switching to. The sooner you try to switch the better, ideally before you even get to Loughborough. If you have an offer there's a chance you may be able to get it changed to an offer for a different course if you ask.
There may also be some amount of flexibility for switching course after your first year, provided you've completed the compulsory first year modules for the second year of the course you want to switch to.