Thanks for the quick response!
Not blaming anyone but myself, but it would have been handy if the website advertised that more clearly. Of course, it might have and i missed it. As we have now paid for the standard application, it would appear we have to cancel an upcoming holiday (as it would take us outside of the UK) unless the Home Office are able to make any sort of amendment.
Edit: I suppose the alternative is that we cancel this visa application and resubmit it? Apologies, i missed your last point about cancellations.