I can't see any writing on either the meter tails or the supply from the other side of the fuse. However, slightly worrying is that the consumer unit is rated at 100A, and the meter tails are definitely larger diameter than those supplying the fuse in the first place. I hope they can cope with uprating the fuse... However, on a possible plus, just below my cutout I have another box with a screwed on lid with two conduits coming in, and two coming out. One goes to my cutout, the other through the wall (presumably to the cutout next door), each carrying L,N and earth.
If the remaining two conduits coming in carry live and neutral (as seems likely), then they would be rated much higher since they supply at least two flats. However, replacing the cable from there to the cutout would involve working live, which might cause issues. Suffice to say I'm not going anywhere near it myself! I'll see what the electrician says on Monday.
Cheers,
Ben