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What mix to use on 1930s house when repointing

Hi, I have a Telford unvented indirect water cylinder (horizontal 250l), which causes overheating issues with water dripping in tundish when the boiler kicks in. We tried replacing TPRV and boiler thermostat but still the same issue. We finally decided to take immersion heater out and took a peek inside the tank, which looked very clean and fine. One thing that took my attention though was how short the boiler thermostat probes are. My plumber thought they might struggle to read the right temperature. See photo attached. Then, we called the Telford technical support which claimed that the design is fine and since the thermostat is at the coldest spot of the tank, the official recommendation for the boiler thermostat is 40 degrees. As mine was set to 60, the guy said I was basically overheating the tank. It sounds fine in its own right, but how about legionella? I thought every hot water tank must be set to 60 degrees to avoid legionella, no matter whether its a horizontal or vertical tank, regardless of the manufacturer etc. I can’t see this 40 degree recommendation on Telford’s installation booklet either. Has anyone had such an issue before and do you thinks it’s sensible to set it to 40 degrees?

my mid terrace ex council house,1 mile from the sea,has minimal loft insulation that's fully chip boarded over.I don't want to take that up but wish to improve insulation .The loft is purely for storage and the south aspect slate tiles may have solar pv panels added.Will blanket be the best solution over the chipboard or should I consider making it a warm loft with under rafter foil.