The key to this is perseverance. Companies will be bombarded by CV’s on a regular basis from trainees, the next person to be booked will quite often be the last person they received rather than the best option available (although they will always want to see that you are capable as well). I would suggest you send your CV across to them every Monday and/or Friday. It may seem like you are “over egging” the cake but you wouldn’t be the only one doing this so you may as well be in the running.
Please don’t be lead to believe that by constantly reminding people of your name, they will get fed up of hearing from you. Quite the contrary, yours will be the name that sticks in the mind and will therefore be the first they think of when they have a requirement.
Ray is correct. Companies tend not to advertise for something if they have an abundance of riches to hand already.
Good luck.