If there is a Woolworths clearance store near you it may be worth a visit.
I went into Slough as a friend said they are clearing Dulux weathershield paint.

In short the 6L cans are £5, the 5L cans £3....but 50% off clearance = £2.50 and £1.50

I took what was on the shelf, 17L for £6.50

lots of other things available, not just diy all 50% off already marked down prices.

www.woolworths.co.uk

Check for discount codes to use at www.woolworths.co.uk