Tricky Dicky wrote:

the readings I got was 1.8 Ohms for the CPC and 0.8 Ohms for both Live and Neutral. Are these OK?

Assuming 2.5 T&E with 1.5 CPE, you'd expect 0.8*1.67 = 1.3 ohms for the CPC

Worth checking for some terminals in need of tightening? An outside
chance of a section of older T&E with 1mm CPC?