Thanks for the reply
I think, but I'm not sure, that UKC4636 is the zip tie in this factory brochure pic and would only be used on cars with a RH coolant tank to secure the coolant tank rubber hose, but feel free to tell me I'm wrong as I'm just surmising ? (my car has LH coolant tank)
It's the large gold coloured metal clip that bolts to the top of the thermostat cover that I can't find listed

cheers
Dan