Not according to the Consumers Association?
The CA has been testing washing up liquid since they started and Fairy has been the Which? best buy since number one. Once you realise that you can use much, much less Fairy than you need of cheap generic brands, that makes sense.
(ubergeekian, Sun 13 Nov 2011, 10:57, 2 replies)

Until their most recent report, which I have right here somewhere.
According to them Aldi's own brand is best value.
But I'd better check that...

Edit: Can't find the September issue of Which? at the moment, but when I do I will report back.
( blaireau69 , the Cumbrian Travis Bickle., Sun 13 Nov 2011, 11:26, closed)

Hmm no
I looked up the Which reviews - highest rating is "Aldi Magnum Premium Original" on 92% vs "Fairy Original" on 91%. Big deal except Aldi's liquid cost 59p and Fairy cost 100p. Which demonstrates my point. If you go for the brand you'd wasting your money. Even if you chose to purchase some other generic own brand chances are that any difference in performance is dwarfed by the price difference.
(MagicMoose, Sun 13 Nov 2011, 21:40, closed)

91% vs 92%
is no big deal, and they take the cost into account when doing their best buys.
(ubergeekian, Sun 13 Nov 2011, 23:54, closed)

They do
But you do also have to have some innate wit and realise that you don't need half a pint of Fairy in your bowl like you do some other types, otherwise the saving is lost. It's part of the reason their washing-up liquid spray thing failed; you were supposed to put one squirt on a sponge and that would do you, which made it very cheap to use. But people didn't understand that and tried to use it like regular washing-up liquid, which made it incredibly expensive.
(richardm, Mon 14 Nov 2011, 12:08, closed)

The score breakdown
From the Which review.

Aldi Magnum Premium Original
Fat removing power - 5/5
Foam Duration - 5/5
Thickness of liquid - 3/5
Value for money - 5/5

Fairy Liquid
Fat removing power - 5/5
Foam Duration - 4/5
Thickness of liquid - 4/5
Value for money - 4/5

So yeah value was taken into account, no it didn't overly affect the scores. So sorry, Fairy is a good washing up liquid, just one which costs an inordinate amount of money and demonstrative of the fact you can get something cheaper which does the job equally well.
(MagicMoose, Mon 14 Nov 2011, 18:56, closed)