I found a 2009 answer on your site, except that the Trend E caravan mixer tap doesn't have a hot/cold plastic plug indicator on the front of the tap handle. I can remove the screw in post that is the tap control lever, but still can't remove the top of the tap to get at the internal workings. Is there another grub screw hidden on the Trend E tap?
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Try fixfault.com to fix caravans/motorhomes.