Remove battery, soak the button in contact cleaner and work the button whilst it's soaked. Repeat a few times, let it dry and fit battery.
If it works- bingo you are 91 quid better off.
It sounds like (and usually is) a dirty button. If it makes it work keep repeating till it's really clean, may take a few goes. Just a quick spray with cleaner will not work, you need the sequence above.
If it's still dead how much is a button and can you solder?
Yokohama Geolanders, Sony head unit, NAUTILUS Air Horn, DRL conversion, Rear cargo space, Elvis Bobblehead, transfer Guard, Indian hanging Elephant, Koni Heavy track dampers, Custom SS exhaust, Voodoo Doll, Adventure Rack with LED ight bar, vintage ERIBA caravan usually attached (yes it's slow)
