And question two - how do you get the bonnet open ?

[tonyidle]

I’d spent an hour plus on google before I asked , so you really did help!

I've done the same before now. Sometimes all it takes is someone else's search phrase.

 

[OldCodger]

Parts arrived yesterday. Once I got through to RHF the service was excellent. £32 for two catches (got a spare) including £5 p&p

Thanks again for the help.