Vauxhall Omega, over heating

Hi, I recently had my N reg 2ltr auto Omega's cooling system flushed
out with a chemical flush and had it refilled with pink anti-freeze. I
noticed there was sand like sludge which came out of the system, even
though I'd flushed it myself about 12 months ago with running water.
As soon as I drove it the temperature hit 100 and I took it back to the
garage. They installed a new water pump and I took it for a spin again.
After about 5 miles the gauge hits 97.5 and is on the verge of going up
to 100 but comes back down again to rest at 97.5. I still think there's
a fault as in the past the gauge never went above 92.5. The fan does
come on at 95.
I am thinking of changing the radiator fan switch and hope it will
resolve the problem.

Anyone got any other suggestions?

The radiator doesn't seem blocked as both the in and out hoses get warm
very quickly and the radiator is even hot. The thermostat is also
working.

.

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