Mark, I'd reiterate my estimate of £100. On a bad day on auction it's a £75. On a good day you could push £110, £120.
Look at the state of this one and it's the only one to sell recently:
http://www.ebay.co.uk/itm/vintage-star-wars-Palitoy-Figure-Catalogue-1979-Rare-/222558319220?hash=item33d1827274%3Ag%3AY4MAAOSwjvJZT1FS&nma=true&si=7K5%252FtzCrwiF8%252FtfklljiJgsVatA%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557