I am not sure of the order to complete my bathroom, do i tile then fit or vice versa?

if you tile first, you will effectively seal the WHOLE floor, so any leak or spillage will be contained within the bathroom. if you dont tile fully under the bath, which you may not be able to do if the bath is in situ before tiling, and the bath does not seal effectively to the floor, then any leak under or around the bath will go through the floor - causing obvious problem if it is above ground floor!! also, tiling the floor is a a lot easier without a big bath in the way!!

Depends on what type of free standing bath, some are designed to sit flush to the wall, in that case you would fit bath first then tile on to bath top so water runs off tile wall back into bath. The other type of free standing bath (oval shaped ) you tile first then push bath up to the wall, if you are having a shower fitted to this type of bath you will need a circular shower curtain so water does not escape. With both types of baths you would tile the floor first.

Bath 1st, tile, then rest of suite

It's a lot easier to tile before bath goes in, remembering any holes that are required for pipes etc, If bath is already in situ, I tile in as far as I can go then I put a run of silicone along the tile edge, I also put a baton along leaving a 2-3mm gap, just as an extra.