Quite likely to be type II (which is somewhere between a B type and C type in the modern post decimal money ).


Dating from the era before striped earth wires, (pre 1970 ish) almost certainly the circuits were originally laid out for BS3036 (hot wire) fuses so any sort of breaker will be fine, bigger risk will be if the wiring in the house has been repaired from damage or extended in-expertly at any time.


Do not be too shocked if there is no CPC to the light fittings or only some of them - from 1970 that was required in the regs, but  in a pre internet era, it took quite a few years for the new methods to reach everyone.


Perhaps if you are  really unlucky it was built during the brief fad for aluminium wire. (not all silver looking wire is bad, tin plated copper is just fine, but be aware that the all-aluminium stuff , or worse copper coated aluminium,  has a completely different feel and is a pain to work with, as it seems to snap when you do much more than sneeze near it, and connecting to it is tricky )

Quite likely to be type II (which is somewhere between a B type and C type in the modern post decimal money ).


Dating from the era before striped earth wires, (pre 1970 ish) almost certainly the circuits were originally laid out for BS3036 (hot wire) fuses so any sort of breaker will be fine, bigger risk will be if the wiring in the house has been repaired from damage or extended in-expertly at any time.


Do not be too shocked if there is no CPC to the light fittings or only some of them - from 1970 that was required in the regs, but  in a pre internet era, it took quite a few years for the new methods to reach everyone.


Perhaps if you are  really unlucky it was built during the brief fad for aluminium wire. (not all silver looking wire is bad, tin plated copper is just fine, but be aware that the all-aluminium stuff , or worse copper coated aluminium,  has a completely different feel and is a pain to work with, as it seems to snap when you do much more than sneeze near it, and connecting to it is tricky )