Its urgent to get idea where i can get some parts for Disco 2 TD5 around zone 3 of london metro...

hi all , need to get some parts to my disco 2 td5 (brake pads and disk,gear box switch etc.)but when it comes the price that i checked some of them on google,saw very high prices,also they gonna charge high cost of shipping,thus do anyone have any good experiences wit landrover parts supplier...