I'm not sure this really counts as a true Supplier Review, since David Hinds are the UK distributor for Celestron and supply the dealers rather than selling directly to the public. But I hope it's appropriate to post anyway.
My C11 experienced some unwanted rodent-based attention in the observatory during a period of down-time. The original posting is here...
https://stargazerslounge.com/topic/304331-wanted-standard-focus-knob-for-celestron-c11/
So on Philip R's suggestion, I contacted Celestron via their central support page. They referred me to David Hinds as the UK support centre.
48 hours later, and I have a brand new replacement rubber focus knob cover on my desk, and no charge - not even postage - along with some advice to install mouse traps, which I've already implemented...
Impressive and gives me some confidence that if I ever needed support for more fundamental issues, there would be a way forward.
So thank you D.H., and to Philip R for the suggestion.
Nigel