Once a sister property to Thomas Barton's Châteaux Langoa and Léoville Barton, 18th-century Château Le Boscq was purchased by Maison Dourthe in 1995. It then went through a complete renovation and a big step up in the quality of its wine. Its 18 hectares of vineyard, unusually in one single block, are planted on gravel and clay soils in the northern part of Saint-Estèphe.

Clay provides a cooler soil which favours Merlot, hence a higher than normal proportion of Merlot is planted – just over half, with 35% Cabernet Sauvignon, the usual hero of the Left Bank, plus Petit Verdot and Cabernet Franc. A year's ageing in nearly half new oak barrels adds to the gravity and longevity of this firm claret. Open early and decant or cellar a while.

This is one of those 'under-the-radar' regions I love to search out, home to the finest quality wines, but not so well-known. As Wine International says, "If it weren't for the [political] line dividing Castillon from Saint-Émilion, its wines would be twice the price. The hills are the same, the soil is the same, the exposure is the same." The estate has won over 150 awards, including the Paris Lauréat Prix d'Excellence – not once, but twice – and Decanter magazine calls it the "leading estate in the Côtes de Castillon". La Clarière is our flagship wine and absolutely no expense is spared. Low yields, careful hand-sorting, months ageing in the finest new French oak, and rigorous tasting ensure only the best parcels become La Clarière. Mostly Merlot, silky, elegant, and supple, with a dash of Cabernet Sauvignon for structure, and slightly portioned Malbec and Cabernet Franc for balance. It's truly magnificent!

Founded 200 years ago, Château Pédesclaux is a magnificent estate, both in terms of wine and architecture. It combines the beauty of the 19th century with the modernity and technological advances of the 21st.

The additional work was undertaken by architect Jean-Michel Wilmotte, whose aim was to place “production at the heart of the estate within a high-performance building that is entirely fit for purpose and makes a harmonious whole with both the château and its surroundings”. It's quite something to behold.

Since the Lorenzetti family took ownership they've converted to organic. Their top wine is a rich, Cabernet-based claret, supported by Merlot, and finely expresses its gravel terroir. Still a young wine – best to cellar or open early.

Fronsac's fine Château Dalem perches high on a hill, surrounded by its 14 hectares of sloping vineyards. It's an historic estate, with records dating back to 1610, that stayed in the same family until 1955. Michel Rullier then took it over and today it's run with great success by his descendant, Brigitte Rullier-Loussert. Its vineyards are nearly all planted to Merlot, with a small amount of Cabernet Franc, and tended with meticulous care.

As you can see from critics' scores (92 points from James Suckling and 94 from Vertedevin), it is an admired claret and one that ages very well too. Matured in French oak (50% new), it has structure and length, but above all an appealing fruity depth. Perfect with roast meat or wild mushroom risotto.

If you come to visit us at Château La Clarière in the heat of summer, we’re sure to offer you a well-chilled glass of rosé. It’s a must, even if you’re a red wine drinker. And when the pink is this good, it would be foolish to resist. We don’t usually have enough grapes to make any sizeable quantity (the rest is reserved for our claret), but the wine has such a following that we always ensure we make some.

It’s a 50/50 blend of Merlot and Cabernet Franc, fermented very slowly and cold in stainless steel tanks. That way we capture the delicate summer berry fruit and zippy citrus freshness. You can breathe in all its lovely aromas, too. It really is as pretty and crisp as its label suggests, and is delicious solo and versatile with food.

Our scout and buyer for the Languedoc-Roussillon is Mark Hoddy. He's always searching the region's vineyards, to check out the vintage and the finest parcels of grapes. This is an ace find Mark discovered first in 2019 via an old friend in Corbières. Close by is Domaine La Lirande, a small estate founded in 1912 by the grandfather, François, in the tiny village of Coulobres. Every year, the Syrah from the domaine's 8 hectares of 40-year-old vines stands out for quality. Just taste the richness of this seductive red. Ripe black fruit, velvety, with smoky liquorice and wild herb notes, it's young, so best with hearty dishes like pasta bake or at a barbecue.