HI,
I've been looking into fitting an aftermarket cruise control for my GDI Plus 4 since driving back from Silverstone via the Motorway and getting cramp in my right leg.
I have found no Morgan specific "Kits". There are a few makers of aftermarket products and plenty of "Mobile Fitters" but it seams all they are interested in is fitting a specific Kit.
This manufacturer
http://www.avsgemini.com/aftermarket-cruise-controls.html has 3 types of controllers, one for None fly-by-wire cars, one for Analogue fly-by-wire cars and one for Can-Bus fly-by-wire cars.
If there were a Kit I'd probably have a go at fitting it myself but as there isn't so I've opted to have the Analogue fly-by-wire solution fitted. I only found one fitter that has given a "positive" response to the modification and they are a 3hr motorway drive away, and they . The fitting depends on them checking the pedal signals 1st so I may have a wasted trip. I'm booked in on the 30th Nov.