Hi Will,
14 14 is absolutely fine for starting out, if it fits you and you can shoot with it then stick with it and save up a bit at £1200-1500 will open up an array of options.
Out of interest what type of shooting are you planning to do and what experience do you have? Why do you feel the need to upgrade so soon? I know of County Champions that shoot with very basic sub £150 guns.
Personally I wouldn't choose a Webley Scott, you want to be looking at a Browning, Beretta, Miroku in 30" with multi chokes second hand, they will return what you paid for them whereas the Webley will most likely loose £2-300 the second you fire it and keep heading south. £1200-£1500 will get you into new grade 1 territory of most of those and be a far better investment.
Welcome to the forum!
Cheers,
Jon.