I have just dug out the Elan keyring, it has a leather fob with a small enamel Lotus badge, on the rear there is raised lettering saying "MELSOM PRODUCTS LIMITED BIRMINGHAM"
Embossed into the leather are the words "KEYFLIX Reg'd Made in England" I think it dates from the 70's, possibly original to the car in 1971 or could have been bought as an accessory later on.
Back in the days of wife swapping partys where you would throw your car keys into a basket, if you didnt have a keyfob of a desirable make you were not going to be a happy chappy
Having a Loads Of Trouble Usually Serious keyfob was probably worse than just a bare bunch of keys