The Natural Philosopher wrote:

Jack Lawson wrote:

What MCB would you suggest please?

I'd stay with the 16A

a 20A radial is a "standard circuit"

https://www.tlc-direct.co.uk/Book/6.3.3.htm

but try and get a
type that is 'slow blow' that can take a second of overload.

a type C MCB is just that, and with only 6' of cable there's no problem
using either a 16A or 20A.