you can get some putty stuff that might temp repair it.
a CityMatic's just a manual type box with extra bits iirc
I was thinking of using some sealent. Might do it tomorrow night after work.
Thanks for the info on the CityMatic's, I thought they were equiv to the Selecta, Learn something new everyday. This is what I've learn't today, and yesterday I learn't to avoid pot holes at all costs.
Many thanks again.