Certainly sounds like 20A radial circuits, considering the fact that 52 sockets are connected across 10 circuits.
Is it a lot of hassle to remove the cover & take a look at the outgoing cables from the breakers?
It would not be common UK practice to install 20A radials for all the socket circuits, however it would be quite acceptable and within IEE Regs (BS7671) to do so.
A 63A Neozed fuse would not be found in UK installations & the lightning arrestor would be very unlikely in domestic premises.
I would be interested to see how this board is laid out inside, because I understand Ireland has different (stricter) RCD protection requirements to the UK.
