In article ,
"Christian McArdle" writes:
As RCBOs cost around 40 quid [...]

Not from an electrical wholesaler...

Out of interest, where can you get them cheaper? The only sub 40 quid price
I got was 30 quid from screwfix, but these were bizarrely Type C, so as
useful as a chocolate teapot.

I've bought from WF and Edmonson (ERD). I don't remember the exact
price, but I'm pretty sure MK single way RCBO's were under £30
(particularly from my local WF which is an MK specialist/stockist).

Type C is unlikely to be a problem, particularly with RCD protection,
although Type B is easy enough to come by and is what I would use on
a domestic ring circuit.

--
Andrew Gabriel