I've followed Wavytone's suggestion and made up an insulating cover using a yoga mat. I added an extra step and did a layer of aluminium foil shiny side down before putting on the rubber. I figured if it reflects any heat back into tube and so forces more through front corrector this has to help.
(It will most likely have no effect at all, but I have an obsessive streak...)
Also, I'm thinking of leaving it on permanently (or at lease long-term) so if the rubber perishes at all there will be at least a tiny bit of a barrier protecting the tube.
pics attached...
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