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When I can, I change TT CU’s to RCBO’s. I don’t really like one central RCD that trips the entire installation. I don’t really get how the overhead TT line could be changed to PME, certainly not in my location.
What's not to get? A lot of overhead lines installed since the 70's will be PME supplies. I don't know if this is universal but in the SSE area every pole that has an earth electrode and N-E link has a label on it with the letters PME in red on a white background. So the availability of PME is easy to check.
One very well respected former member of the forum insisted that only overhead supplies can be true PME supplies.