Due to the possible health hazards from mould, and the risk of mould growth due to interstitial condensation I would not put 100mm of insulation inside a hollow block wall, especially if I had another choice.
Most builders have not even heard of the risk.
If you google you will find articles about it. i think one was called breaking the mould.
The reality is that we have not been putting 100mm of insulation on the inside face of hollow block walls for long enough, to know how effectively mould will grow, and how much the inhabitants will suffer.
The wall behind the insulation will be cooler, so it will be below the dew point more frequently, so more water will condense on it and mould is more likely to grow.
It will not be able to breathe as much internally into the house, so it will give up less moisture during the warmer summer months. over several months or years, the wall will become wet.
If you have to go this route, dont put much insulation on it.
I'm not a professional in this area, but I did some research for a project I was looking at.