Geoff wrote:

gets worse in th summer months. I've tried everything over the years to
correct this, changing boiler settings, pressure balancing valves,
changing shower head and hose to increase flow rate etc.

Have you tried leaving a basin tap running a small amount while showering?

I'm now about the change the shower (we want to change it anyway). I
was wondering about the best one to pick to remove this problem.

I've been looking at the mira excel which says it is designed for this.
Does anyone have any experiences of this and can point me to the best
one to achieve max flow rate to get over this....?

Make sure you go for one with controllable flow rate (some are fixed
flow and only allow the temperature to be adjusted).

--
Cheers,

John.

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