Thanks for the info. Makes the savings even better.

As User777 says the PYO discount comes off the ITEM PRICE on the SEL, irrespective of any other offers that may apply, such as being included in a "buy 4 for £6" offer.

Hence £1.79/bottle means the PYO saving w/be 20% of that SEL price.

(Obviously the Budvar SEL price is £1.43/bottle as THAT doesn't have a multibuy offer, but has already had a temporary price cut offer applied - ie normally £1.79 but 20% reduction for everyone currently = £1.43 SEL.)

Tip: another item with PYO opportunity AND multibuy saving (to 3/1/17) is the French Emmental @ £2
that is also in a "buy 2 packs for £3" deal, ie get both for £3 - (SEL £2 * 20%) = £2.60 or even £2.20 if you chose 2 x PYO Emmental rather than say one & a £2.99 Mozzarella.
http://www.waitrose.com/shop/OfferDetails?storeId=10317&catalogId=&langId=-11&offerId=13244900
(The SEL labelling of the 2 for £3 offer itself is VERY discrete/understated in my store!)

they take PYO 20% off from original price:
4 x £1.79 = £7.16
1st off (4 for £6): -£1.16
2nd off (20% from £7.16): -£1.44
£7.16 - £1.16 - £1.44 = £4.56 for 4 bottles -> £1.14 per bottle

Happy to be corrected but I work it out as:
20% off £6 = £4.80 for 4 bottles
£4.80 / 4 = £1.20 each

I had some vouchers in the mail from Waitrose including £2 off a £10 beer purchase which makes it even better

Hmmm.
This or the Fursty Ferret deal 4 for £6 which is also in PYO.
£1.50 with 20% off = £1.20.
Or maybe both ?

nice spot OP!.
The Waitrose normal £1.79 reduced to offer £1.43 runs to 3/1/17, and you should have 10 December opportunities to amend your PickYourOwn list - ie to include this product to save 20% of that £1.43= £1.14

Great price for a decent pilsner.

Bud

Nice tip, thanks

hot deal great find op!
There is only one original..

Crazy price! Hot!

Shall be picking some of these up tomorrow!

Don't mind if I do

Nice spot - its a reasonable lager, but a bargain at that price