I'll explain. The UASs are usually so oversubscribed that they have to turn away high calibre candidates who would happily sign their lives away to the RAF.
i wanted to be in the RAF but i cannot commit myself to it full-time
There is no room for people who are not 100% dedicated and if you're looking at it as just a way to get civvy licences and then jump ship, you're outta luck. Virtually everything you could wish to know is easily available from various sources and has also been covered before in the 'sticky' thread at the top of the page. The fact that you haven't researched these yourself and your quote, above, suggests to me that WWW has made a valid point more eloquently and concisely than the rest of us could.