I had been thinking about the silent indicators on my Elise S3, then came across this thread from the Exige V6 part of the forum. Well, the mod works for the Elise S3 as well!
I bought this flasher relay and swapped it out for the silent Perei module.
Happy days! Clicky indicators and hazard lights. For the sake of £9 it is one of the best and cheapest modifications yet that I've made to my Elise.