I sympathise. It is really tough getting rejection after rejection and I don't think it's easy to pick yourself up and carry on. You are so clearly bright, articulate and level-headed though, that I predict a great future for you, whether that's as an actor or in the jobs you do in between acting!
I wouldn't give up on those two agents just yet. There's no harm in politely following up your enquiry and asking whether they have had a chance to consider your application for representation (and asking Kelly Management if they could reschedule a meeting). If they are interested, they won't reject you just because you're chasing it up and if they're not interested, they can tell you so and you can stop wondering. You could also ask whether it would be worthwhile applying again in the future and whether they feel it's a lack of experience or your age or something else which means that they are not interested in taking you on just yet. They may well be prepared to give you advice.
One thing that might be against you is your age. I seem to remember you saying that you look quite young for your age? Or am I confusing you with another poster?! If you do, and your current photo reflects this, then what I'm about to say may not ring true! If you look your age then the agent may not be quite as interested in you because there may be actors who are passed school leaving age on the agents' books who can pass for 14/15 (and they won't need a licence). If you honestly look much younger than your years (and your photo reflects this) then this might not be the reason.
You might just be too much like other people the agents already have on their books. If this is so, there's not a lot you can do about that fact!
When you have your film footage, you can get a short showreel made and you may find that agents are more interested once they have viewed it .
In the meantime here are some suggestions:
Keep looking for agents. Get hold of a copy of Contacts and Actors' Year Book if you haven't already got them and consider applying to some agents you haven't yet tried (but don't sign up with anyone who just wants your money or who will take you on without meeting you).
Contact film schools and tell them you are interested in getting more up-to-date showreel material to go with your Harry Potter footage and ask them to contact you if roles come up for which you might be considered suitable. Try the really well-regarded schools first (e.g. NFTS and Bournemouth) plus any that are anywhere near you.
Consider a subscription to "Shooting People" which regularly carries information about student and low budget films.
Keep an eye on your local council website:occasionally there are local initiatives which include film-making or acting workshops.
Look at the websites for any professional producing theatre near you. Many producing theatres have excellent education departments with really good workshops or clubs for young people. This can provide great experience and sometimes some good contacts.
Try to get involved in as much youth and amateur theatre as you can fit in. This can provide an opportunity to stretch your acting muscles, shows an agent or CD you're not just after the bright lights and Hollywood and can be great fun. It is often the case that you get to play much more demanding and interesting roles in amateur theatre than you get to play as a professional!
Consider your long term goals: look at www.ncdt.co.uk and think about future training.
I understand that you want to get represented by a good agent and I hope this happens for you, but if you do some of the other stuff too it will help you to feel you are not just treading water.
Good luck!
