To paraphrase s360-25(1)
The taxpayer is entitled to receive the sum of 'any money received, or entitled to be received, by the company, for the issue of shares' and 'the market value of any non cash benefit received, or entitled to be received, but the company for the issue of shares'.
Looking at this, it would appear that the requirement is that the ESIC is 'absolutely and unconditionally' entitled to the amounts, i.e. the only condition is the timing of payments.
This is particularly useful to know in regards to last minute investments around 30 June, which may or may not be banked, though they must be committed, unconditionally.