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OK cheers will test shower output of the mixer directly without the hose tomorrow and see if that works. Oh and I don't think it's anything to do with the thermostat, as this problem occurs for pure hot, pure cold, and everything in between.

We have a unvented system that was installed about 18 months ago. Everything works fine except for the shower - it has always been weaker than I had wanted, and has got worse in the last year or so. The main problem is that the shower flow rate slows to a dribble over the course of 10 minutes...