Spotted this. I just stocked up elsewhere, but this is extremely good value for a 507.00 spec oil.

http://www.eurocarparts.com/ecp/p/car-accessories/summer-essentials/car-accessories/summer-clearance/?521771805&0&1&cc5_1051

Use code TWEET5 for extra 5% off, £85.49 for 25 litres with the code.

That is a good deal. Also, if you go through a site like Quidco you'll get another 5% back. I recently got 5 litres of Mobil 1 5w30 from ECP for about £27 as they had it priced about £34 or so, but then they had a 15% off code advertised on their website, plus I then got 10% cashback.

Not as good value as the above, but pretty good still.