Oops! Big apology to Fibonacci if I've not paid proper heed to rules, thought I'd completed everything before posting. Will keep this in mind for future posts. But many thanks for the answer Mandy.
Also thanks to Davemano for answer Primrose.
Just needing definite answer for no. 1 now.
What do they say about old age not coming itself!
Thanks for pointing out Fibonacci had already answered no. 4 - and I'd even thanked him for his answer!