Lets say i did go down the route of buying new glass, What lens/s should I buy?
my budget is about £700. And should I sell my current basic lenses: canon kit lens 18-55mm and Canon EF-S 18-55mm f/3.5-5.6 is - EF-S 55-250mm f/4-5.6 is Lens.
if you mean your budget is £700 without selling your current kit then your current kit including the 450d body is worth around £450 , for arguments sake say £1100 to play with , lots of options there to invest in a better body ( 40D ) and glass of your choice ( depending on what you need ) if you want to buy secondhand
You'd never get £450 for a S/H 450D, you can get a new 500D with kit lens for not much more than that.
Lets say i did go down the route of buying new glass, What lens/s should I buy?
my budget is about £700. And should I sell my current basic lenses: canon kit lens 18-55mm and Canon EF-S 18-55mm f/3.5-5.6 is - EF-S 55-250mm f/4-5.6 is Lens.