Thank you Mattrom for the hint. I'll be reviewing my Thomas Hardys!
And Jonno your solutions must be so much neater than mine. First of all I highlight all the unclued lights in pink, then there's a myriad of erasures, and lots of scribble in the margins.
So for delay in acknowledgement. I seem only to be able to post via my PC, and not on the phone. Even though my phone says: Hello Blackcat and all the rest.