Ok firstly I wish to point out that CPD does not begin after you graduate. It is an ongoing process that you will have been engaging in throughout your undergraduate career and will continue to do so after you graduate. To think you cannot include this will most likely fail your registration application as it specifically states you must include this area.
Think of incidents whereby you can reflect upon, IST sessions you attended during your placements, any patients that particularly made an impact on your practice etc..... the list is endless. This all counts as CPD, along with learning contracts etc etc.
I strongly advise you look on the board website also for the FAQs, and registration form....there is SOOOOOOOO much useful stuff in there to base the foundation of your application.
I wrote mine in quite a lengthy way so it took ages, and will probably take ages to go through (sent it off a month ago and have only just heard that they received it).
However if you have any specfic questions feel free to email me and ill do my best! email addy is [email protected]
Hope this helps!