This price is for the White shell/red core only.
RRP £29.95 which is what some of the other colours are selling at.
No idea if this is any good as there aren't any customer reviews to go by, but at £3.37 I thought it would be worth a punt.
Spec from amazon
Brand: Blue Marmalade
Part Number: HOLLOW-WHT/RED
Assembled Depth: 155 millimetres
Number of Lights: 1
Maximum Compatible Wattage: 11 watts
Voltage: 240 volts
Specific Uses: Indoor use
Shade Colour: White Outer - Red Inner
Shade Material: Plastic
Plug Format: G - British: square plugs.
Power and Plug Description:: Plug