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That was my inclination yes - I had understood from several calculators and manufacturer specs that 2.5mm 3-core clipped to external wall would be adequate for my couple of sockets to my shed?
It would likely be fine for a couple of sockets yes, it is definitely not fine for a 32A circuit though.
No I wouldn't install another RCD as that would not comply with the wiring regulationsWhile my main board is new and the secondary CU is on a 40A RCBO, would you put in another rcd at the shed end for good measure or is this pointless?
My secondary CU which the shed is all mcbs and given this runs my heating, would be more than inconvenient if the shed sockets were to blow.
Yes that will be inconvenient but with an RCBO at the supply end you are stuck with the risk of that happening, even if you put another RCD in the 40A RCBO will almost certainly trip first in a fault.
will endeavour to consult my electrician friend in the design as you suggest. He struggles with English a bit though.
You may need to get someone else to help with the design of the job then, understanding the wiring regulations can be difficult even for some people who don't struggle with English.