As far as I am aware within the UK there are only two manufacturers supplying AFDD, Hager and Siemens with their Wylex and Crabtree branded products, therefore it is impossible for one of them not to end up with more than 40% of the market share.
Edit- I should have said for domestic consumer units.
Even if other manufacturers can licence and produce the the equipment, one or both of those manufacturers will almost certainly end up with more than 40% of the market share, so I cannot see a way that it can be introduced without approval from the CMA.
As far as I am aware within the UK there are only two manufacturers supplying AFDD, Hager and Siemens with their Wylex and Crabtree branded products, therefore it is impossible for one of them not to end up with more than 40% of the market share.
Edit- I should have said for domestic consumer units.
Even if other manufacturers can licence and produce the the equipment, one or both of those manufacturers will almost certainly end up with more than 40% of the market share, so I cannot see a way that it can be introduced without approval from the CMA.