You have to ring Chris Kay (step 3/4) and advise them you aren't available. Assuming you are level 4?
Be prepared for a tough conversation as to why your date isn't closed if not available. We had an email reminding us of when the cut off was and asking everyone to double check their dates in case bank holiday closed when available.
it can be difficult, but you need to try and keep your calendar a month and a half to 2 months up to date in advance. With work and general life it can be hard. But if you want to climb the ladder, it's part and parcel of it.
The rules have always been that once the next month's appointment come out, usually between 20th-23rd of the current month you have to close the following month.
E.g. appointments for September released on 20th August.
By 23rd August (assume all working days) would need to have closed October.
Any dates closer after this time have to be rung through to the appointments officer.
As November appointments have been released Dec should have been done by the 25th October.