The one they currently do is £90 inc VAT and a 2-tonne rating, but it's been recommended to me too...and yes, when I lifted it (badly) by one hand in the shop I nearly put my back out - clearly Arcan use the same extra-heavy aluminium as Jaguar do!
That one sells under various brand names. I bought the same in blue from B&Q a few years ago for £50. I think they sell it in Machine-Mart for about £130? Either way it's quite a good jack.