the hole is where the fins are, do I just ram the putty into the fins???
like this:
http://www.halfords.com/webapp/wcs/s...Id_165691#dtab
it has pictures of taps and radiators on the packet so should be good.
I will change the coolant and flush it out though, it needs doing (which is why it could have failed in the first place, the corrosion inhibitors have gone........)
And get billy bonus points off the Mrs for not spending ages on the BLOODY CAR