Hi Adrian,
The Elder and Rowan had the normal 3 white towing / masthead lights which were the regulation 2 metres apart and below them on each side of the mast there were three NUC lights which were all round lights, top red, middle white and bottom one red. These should also have been 2 metres apart but because of her construction dispensation was given for them to be only 1 metre apart.
They also had a white all round morse / anchor light on the truck (top) of the mast. Finally, there was a blue flashing strobe light placed underneath the radar bracket which was the burglar alarm!!! As it was only small, you could leave it off and no one would notice.
Cheers, Fred.