Although I was told that there should be a switch on my dash, I think that that info was given me by a guy looking at a US version, as per the link above. I've seen several UK cars here
https://www.uksportscars.com/view/lotus-europa-twin-cam-special-5-speed-1973-stunning-jps-black-with-gold-stripes/The dash on this, and several others, are nothing like the US dash i.e no hazard switch as standard. As someone has pointed out that this type of switch was an aftermarket fitment to those who felt the need.
Picture of the switch are posted a few pages above.
I've tried a new Lucas 2 pin relay, and I did wonder if my original has gone pop and the new one is not the same spec, and I should try and locate a new-old-stock relay?
As I'm getting power to the light bulb wires at all four corners and continuity of the earth at all four corners I feel that it can only be the relay.