Collants just dipped below the line,its the red type,ive read that mixing a different colour renders it useless.

http://www.eurocarparts.com/ecp/c/Ford_Focus_1.8_2005/p/car-accessories/engine-oils-and-car-fluids/antifreeze-and-screenwash/red-antifreeze/?523770512&0&cc5_866

Will that be ok and can i just top it up?

i would only replace with the ford stuff from a dealer the link is for 5 years fords is 10

if its just a small amount you need to top up then just use water? the ford coolant is 50% concentrate and 50% water

i would only replace with the ford stuff from a dealer the link is for 5 years fords is 10

The older orange/pink stuff is 5 years? The new purple stuff is 10 I think? Both can be mixed together though.

blue or green stuff is 5 years ford pink stuff is 10 years on the 10 year service it should be changed with the purple stuff which is also 10 years