... but in any event there is also a lot of information which can be retrieved using the 'accounts' end-point...
Thanks, but thats not available to us mere mortals, its also documented as a post, so will write data. Already tried it, and as a get, and other similar endpoint permutations (eg /account/{account number} = 404), it returns 403 - forbidden.
As @newbie_t says, our account number (A) also bears no relation to our gsp (H)
I do have a call out with the API team. Hopefully their documentation is incomplete.
That site I linked to must be doing something with the account number? If Octopus is a true REST API, I could also interrogate it to see if that revealed anything, but thought it easier to ask.