small update, i removed the plastic guards inside the door to give me access to the sills, i then found a grommet that would give me access to get some wax pumped in there. I used bilt hamber anti corrosion wax after hearing good reviews on it.

http://www.bilthamber.com/dynaxs50.html

I used the full tin on the 2 sills, to the point where it was actually dripping out of them! Hopefully that should give them enough protection!
My order of mastic 121 arrived this morning and i've sorted out a space heater so i'll start on monday and get the floor sorted. Also have an order of brake discs, goodridge lines and mintex pads due!