Ok from purely a person with a limited knowledge of SEO, websites, etc. Some points that I feel IMHO are wrong with your site:
http://www.ricardodenozo.co.uk/escort_services/UK_Escorts/
Too much use of the word escort and escorts in URL
Taking it to the next level gives me this
http://www.ricardodenozo.co.uk/escort_services/UK_Escorts/North_West_Escorts/
Way too many escorts. Search enigines especially Google will penalise you for the keyword escort and will drop you off the rankings.
And lets face it Escorts is one of the main keywords you want to target, not like say the keyword Toothpaste...
Our Escort Directory aims to achieve over *1,000,000+ unique visitors each month
I think you sould lower that figure by miles that works out to be averaging 32,259 people a day visiting your site. Punterlink will tell you he only gets 15,000 a day. So you expect to do double that. Ladies aint thick they will twig and bog off elsewhere.
Again Prices:
The cost for one year exclusively within a specific category is ?1500 GBP.
I think your living in cloud cuckoo land but I suppose aim high is the motto.
Payment processor:
Paypal - Does not allow adult websites, that even includes escort directory listings with a mere hint of sexual language. They will shut you down and freeze account funds. None starter I'm sorry.
Again dont take my comments to heart they are not designed to put you off, more to give you an insight into problems that I have also come across during my years.