Update:  I bought an RLHM module from Retronics for about £55.  When fitted the Hazard lights worked well but the tell light was on permanently.  Also, when I tried the indicators all lights came on together.  When I finally heard back from Retronics they suggested I fit diodes to both outputs and move the tell light to one of the outputs before the diode.   
 
Suitably unimpressed, I fitted a 12VFL flasher unit (about £12) identical to the one I have used for the indicators and fitted a pair of diodes in parallel to the output.  All now working beautifully. 
 
It's not completely plug and play.  A few wires have to be moved around but it's not difficult.  Anyone thinking of following suit is welcome to copy my homework. 
		
		
		
		
		
		
		
	
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