Thanks guys.
Yes, 75 Sqn was made up of personel from the RNZAF. They had originally been sent to the UK to pick up Wellingtons and fly them home. When war was declared the New Zealand goverment made them available to the RAF which gave them the 75 Sqn designation.
It was slightly different from the other Commonwealth Sqn which flew with the RAF, known as Atticle XV Sqn's. https://en.wikipedia.org/wiki/Article_XV_squadrons
But where as the Article XV Sqn's were attached to the RAF, 75 Sqn was equipped and controled by the RAF. While none of these Sqn's were actually a part of the RNZAF/RAAF/RCAF, i still like to use the relevant nations air force badge.