It’s not a great time to buy camera equipment right now. Places where you could get good deals are sticking up their prices due to the awful exchange rate.
I get most of my stuff from here:
http://myworld.ebay.co.uk/123fstop/
All prices have gone up 10-20% (around £200 in most cases).
Thats the trouble making a business out of buying and selling goods. It all goes **** up when the exchange rate drops.
I’d think around £600-800 for a 35-350mm lens. You can get a brand new 100-400mm for £1k.
HTH
Alex