Is this just a case of a new gasket?....and if so any links/part nos to said gasket.
And was it do???

Noticed it two days into a trip to Brittany.....apart from a sleepless night after finding it, it wasn't a problem, thankfully!!!

E D I T....Found the gasket on the heritage site......
So any tips on fitting....is it worth replacing the o ring t'other end, in case its damaged with all the tugging etc while cleaning gasket end???