i've just had the same problem on miine ,easily sorted disconnect pipes on your heater matrix and last out the cap thats in it ,takes about half hour max,just be sure to check your coolant level afterwards,problem solved all being well.
Might take the fan off till it gets a bit warmer
and cover the rad grill, it REALLY does help
thanks but what do you mean last out the cap ?
thanks will give it a go.i suffer with lysdexia mate meant crap