I said I would try the adjustable flasher unit out & report back, what I actually did was put my shoulder out. This stupid action precludes any scrabbling about in the foot 

well. I repaired to the workshop & simmered for a while under a cloud of my own frustration, having narrowIy missed falling over the dog I set up a test jug using a jury rigged wiring loom & assorted lamps, both incandescent & LED. 
I can confirm that the electronic unit will replace the original Lucas unit, at least under bench conditions. However they are not pin compatible as well as different physically. 
The poles are reversed, which is going to irritate if you manage to insert it into a socket designed for the Lucas unit. 
A picture might illustrate better. 

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