(BBC) - French wine production is likely to be 10% lower this year than in 2015 because of frosty weather in spring and a heatwave now, officials say.

A production of 42.9m hectolitres (hl) (944m gallons) is forecast for 2016, down from last year's 47.8m hl.

The harvest is expected to be down by about a third in the Champagne region.

Prices will rise, although one French wine trader said the Brexit effect would be a greater inflationary pressure for UK buyers.

Jean-Pierre Hourlier, who sells mid-market French wines in the UK, said: "Prices are going up across the board because of the euro and the impact on transport because of Brexit."

After the British vote on 23 June to leave the EU, the pound slumped against the euro, falling from €1.3 in late May to €1.17 now. Imports priced in euros are therefore more expensive.