I've never had these speakers, but I see the drivers regularly auctioned on Ebay.
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I had to replace something (twice) on a 104.2 but I don't remember if it was a midrange or a tweeter. As mentioned, drivers often appear on Ebay. At one time, KEF supposedly maintained records for each speaker, so that by giving them a serial number, they could provide a replacement driver that would precisely match the original as well as the other speaker. I don't know if that service is still available. I just called a hi-fi store in my city and got a phone number for someone who works on those speakers.