Dave – Thank you. These were all checked in Ullswater – indeed it was whilst doing a full check with the aid of John Mellor that we realised I needed a shorter halyard. I have measured the old one and will probably buy a new one – then at least I have a spare…..
Interestingly, differing from Mato’s dimensions my current halyard is 6370mm with an LP of 300mm – so I will get a slightly shorter one (but no where near as short as his).
Thank you all for your suggestions.