The Decanter review of 2010 Barolo includes a good number of wines at £30+, £40+, even £50+. There are even a couple for £75 (and I just spotted one for £140!). I am sure they are very good but I am unlikely ever to taste them at those prices.
Of course, given land prices, there is such a thing as too cheap Barolo (I saw some in a shop recently for £12. I bought a bottle: it was dreadful) so what is a good starting point? I think, on the whole, around £25 should buy you a decent wine. In the 'Highly Recommended' section fo the review (wines scoring at least 90 points), only four or five wines (out of 71) are in this ball park and the top scoring of these is...
Filippo Broccardo e Figli, Monforte d'Alba 2010
'Pristine and pretty aromas and flavours of red cherry, flint, citrus peel and white stone fruit. Fleshy palate with full, savoury flavours and hints of smoke and cedar. Good balance with a harmonious finish'. Drink 2020-2035. 91/100 or 17.5/20
It's in need of further ageing, as the review suggests, but the 2009 is fabulous now and it did rather well last year (and we still have a few bottles left)!
"Spicy oak aromas of vanilla and liquorice. Fresh and rich on the palate
at first, then smooth and balanced. Very pure red fruit and polished