Thanks for that Marksman. I did note the 'shoulds', but the risks when one gets the interpretation wrong in relation to shooting and firearms are so great nowadays that it is better to take extra care and ask those who are more experienced.
As for areas classified as deer habitat I did ask the Game Management Authority, not the local Fire Arms Officer. My district is not classified as a recognised deer habitat, though there is a resident herd of red deer. The Officer did make it clear that my Yukon night sight had the same illegal status as a spotlight if I was out at night on Crown Land considered deer habitat.
Jim