Not C du Pape. Unless you're confident he's a Rhone man, that is.
Someone noted Chablis goes well with curry. It does indeed.
£30 on a red, is it definitely going to be had with curry?
If not I would procure him:
2006 Chateau du Tertre which should be about £28, Cru Classe from Margaux, was delicious when I had it and it was accessible in spite of being young. Forget 2003 or 2005 for under £30 really, although yes 9/10 and 10/10 years respectively.
Perhaps have a look at the second labels of the Cru Classes. I think you should be able to find some in the store you're going to. Among them are some top class wines. Also many of them aren't necessarily for keeping either. I've just been on majestic webby and you can get the Ducru-Beaucaillou 2nd label for £25. '06 St. Julien. I would go and buy this for myself *** the boss lol. But that would be superb.
You could try the Tourelles de Longueville , however I found it somewhat closed.
Fleuries are always a good bet as they drink nicely and fall nicely into your price range. Not great curry wines though I'd suspect. Also you could get some Volnays in that price range as well I think.
Hope that helps.