Answering my own post here.

After speaking with Logitech Support apparently it is not possible which is pretty disappointing.

However on the plus side, the support agent gave me a code for 50% off a 1100 from their online store so I've been able to order a new replacement for a respectable price. Now I just have to wait for the new unit to turn up and then go through the "joy" of reprogramming it.