Hi western - thanks for the link. I've been in touch with Paul and while he doesn't have the connector, he has been very helpful with the part number and some other options. My continued Google searches led to me discovering that it is also the same as a Ford Focus horn connector and I've found a UK supplier: https://www.simtekuk.co.uk/product.php/epc_2_way_sensor_connector/?k=:::7160861
I'll let the forum know how I get on.
Thanks
Steve