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There is no space for a separate isolator. My own view is that 462.1.201 does not necessarily demand a single means of isolation but I would appreciate the opinion of others. Even if there was a non-compliance, I do believe that the separate arrangement proposed is a much better alternative.
It's also common to have two (or more) separate means of isolation where there are multiple sources of supply (e.g. PV systems).
My reading of the regs is that the intent is to have single means of isolation where at all possible, but labelling might suffice in other cases.
How much space is there? If there's room for a pair of Henleys there might be room for some kind of isolator that could feed 2x 25mm²...
It is rather like the common E7 situation with one CU for storage heaters and another for the rest of the site - when they are more or less side by side and well labelled, there is no problem. On the other hand if one CU is under the stairs and the other in the garage I might be more concerned that someone may isolate the wrong thing in a hurry- which is the intention of the regs and what it is all about really.
Perhaps A REC2 before the Henley blocks only if the 2 isolators are remote from the point of split.