Sweetpea...you actually have two coolant bottles....the one you can see behind the number plate is just the expansion tank (overflow) and then the main 'pressurized ' tank (you will need to take your engine cover off to see this) on the left side on a petrol/watercooled engine.
The latter needs to be filled to the brim, 50/50 mix antifreeze/water, the one behind the number plate just to the max line under the filler cap, also 50/50 mix.
Martin
On wings like angels whispers sweet
my heart it feels a broken beat
Touched soul and hurt lay wounded deep
Brown eyes are lost afar now sleep xxHayleyxx