Sorry this is late, I only usually look once a week when the summary comes around. I have carried quite a few 'serious' Grounding / Earthing related works in the past. In one case, in a very large shopping and business complex in the upper Midlands, with its own substation in the basement, I determined (and they eventually admitted after legal pressure) that they had failed !!!!! to reconnect the Earth to the whole building after they had tested and commissioned the substation! So much for the "professionals" in the DNO's.
Another case was a multiply-supplied (with originally 6 separate meters) industrial/scientific starter-unit complex (with a different DNO) that eventually had one pharmaceutical owner and had really high EMF magnetic fields in their labs (like 50 microteslas) from stray currents which were affecting the biological research results. I determined what the problem was. It was in the local distribution network and not their own supply cables. The only way to sort it was to remove all but one of the network protective Earths and rely on that and the buildings steel structures into the ground (like super Earth Rods). That sorted the problem and the DNO agreed with me that it was the only practical solution. So we did that BUT also affixed signed warning notices at all the incoming supply points to say what we had done in some detail and why.
I agree with SparkyChic that ideally the CPC should be of adequate size, but, if as you say, it is a dual RCD protected installation then all any CPC needs to carry will be 30 mA (or possibly 100 mA). This is not yet reflected in BS7571 - even in the latest 18th Edition.
I think, if you leave it that way, you should stick a notice near the CU saying that is what you have done. It should be safe, but it should not be un-noted. I would have done what you did.