Those cables look like 16mm split concentrics & 16mm DI tail.
You could bore thro from meter box and run new 25mm supply. either concentric or tails, ready for new metering(THTC meter will go).
That's a series 6 house service cut out. That would usually indicate a TN-S supply. The series 7 (ie no earth block at the top right) would normally be used for TNC-S. Of course the series 6 can be reconfigured internally for both TN-S and TNC-S but the lack of the PME sticker does suggest TN-S.
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