The answer to the subtraction sum in the title is 1947. So all the unclued lights are celebrities who celebrate their 70th birthday this year. The first letter of each clue, read in order, announce Doc’s 70th birthday.
First prize Emma Wood, Loscoe, Heanor, Derbyshire
Runners-up Tom Richards, Haverfordwest, Pembrokeshire; George D. Logan, Columbia, Maryland, USA