From an Asda flyer here are 8 that are in the 6 or more selected wines:

Cortebella Pinot Grigio - £5
Hardy's William Hardy Shiraz Langhorne Creek - £6
ASDA Extra Special Prosecco - £7
Anakena Cabernet Sauvignon - £6
Anakena Sauvignon Blanc - £6
Barefoot Pink Moscato - £5.75
McGuigan Classic Merlot - £5.75
Fillipo Sansovino Pinot Grigio - £5.50

NB: All prices before discount

Unfortuantely it doesn't say but I suspect it lasts for a week, they appear to change the wines each week at the minute

I've just been to the Trafford Centre Asda and was confused though it may be because they are in the process of relabelling. The wines last week had the 25% off label removed but the wines on offer had no indication of 25% off 6 or more. There were a number of the offer wines at the end of the aisle but again no 25% off label. I went to the customer service to ask and they pointed me to the offer aisle (which is near the entrance) and there were a number of wines, some in the flyer some not. I decided to test this and took a bottle of Anakena Cabernet Sauvignon and Yellowtail Cabernet Sauvignon (which isn't in the flyer) to test at the Customer Service by costing 6 bottles of each and this did knock 25% off both wines.

As I said I might be early and they've not labelled them yet but there are more than the 8 in the flyer, a couple from last week are still in , Barefoot Shiraz, La Moneda Cabernet Sauvignon amonst them. I'll keep looking when I go which will be next week now

Great deal. Six bottles of Prosecco for £5.25 per bottle. Thanks.

The offer is still on and on the offer aisle labelled as 25% off. be careful as there are some wines that aren't in the 25% off on the same shelves, from pictures I took:

Hardy's William Hardy Shiraz Langhorne Creek - £6
19 Crimes - £7
24ct Prosecco - £8.50
Fillipo Sansovino Prosecco (magnum) - £14
Heidsieck & Co. Monopole Blue Top NV - £20
Cortebella Pinot Grigio - £5
Yellowwood Mountain Reserve Shiraz - £6
ASDA Extra Special Prosecco - £7
McGuigan Merlot Classic - £5.75
McGuigan Pinot Grigio Classic - £5.75
Koru Sauvignon Blanc - £5.98
Anakena Cabernet Sauvignon - £6
Anakena Sauvignon Blanc - £6
Gran Colina Rioja - £5
Yellowtail Cabernet Sauvignon - £5.75
La Moneda Merlot - £4.70
La Moneda Sauvignon Blanc - £4.70
Barefoot Shiraz - £5.75
Barefoot Moscato - £5.75

All prices before discount, more to follow.

and more:

La Moneda Rose - £4.70
Sancerre Rose - £10.97
Cono Sur Bicicleta Viognier - £6
Cono Sur Bicicleta Sauvignon Blanc - £6
Yellowwood Mountain Reserve Chardonnay - £6
Barefoot Sauvignon Blanc - £5.75
Echo Falls Chardonnay Pinot Grigio - £5.50
Wolf Blass Gold Label Shiraz - £13 (ouch!)
Extra Special South African Sauvignon Blanc - £5.50
McGuigan Reserve Chardonnay - £7
Extra Special Chenin Blanc - £5.50
La Moneda Chardonnay - £4.70
Blossom Hall Pinot Grigio - £5.50
McGuigan Classic Shiraz - £7
McGuigan Classic Cabernet Sauvignon - £7
Calvet Bordeaux Fleur Baron - £6
Cono Sur Bicicleta Carmenere - £6
Vina Albali Valdepenas - £6.48
Yellowwood Mountain Reserve Pinotage - £6
Blossom Hall Merlot - £5.50

All before discount

The deal is still on same wines but check these 2 out:

http://www.hotukdeals.com/deals/tesco-wine-25-off-when-buy-6-more-from-18th-2496842

http://www.hotukdeals.com/deals/25-off-6-bottles-wine-more-sainsburys-2496188