I have to refill the raidator bottle but which one is it?

The probability is the heater valve has failed. It is located under the bonnet in the centre near the windscreen.
If i were you i'd pop into a ford dealer & ask one of the technicians for advice... Don't go into the reception, just hang around the reception carpark & ask one of the boys in blue for advice. Most are fine.
If your advised to buy a valve then ask for trade discount, again most will oblige. Alun. Its a common fault on KA's

Alun
January 2008

Hi Mitzi, the bottle is in the back left corner of the engine bay as you look in, make sure the engine is cold before removing the screw cap and preferably cover the cap with an old towel or large rag when un-doing it, a common cause for no heat is the heater valve or the thermostat

nigel
January 2008