Those who don't pass 1st time are usually better riders than those that do... mainly 'cos they respect their license a little more and aren't c@cky mummies boys who are gonna wrap their bike round the first lampost they find in an effort to show off!
Rant over.
... stick with it. Sidcup in South East London's not too bad. But they are hot on observations and making progress.
Quite rightly, they won't pass you if your dangerous!