Silverstone is urging fans to act swiftly if they want to take advantage of reduced rate ticket prices for this year's British Grand Prix, with the offer set to expire in just over 48 hours.

The deadline for purchasing tickets at discounted rates is 1700hrs GMT on Thursday (7 February) and, to add to the urgency, only a limited number of 'Early Bird' tickets are still available.

Silverstone has confirmed that more than 50 per cent of tickets have already been sold for the 30 June race, which should see four British drivers line up on this year's grid following the addition of Max Chilton to the Marussia ranks.

A number of grandstands are already sold out, including International Pits Straight and sections of Club, Village and Woodcote, while general admission tickets, providing fans with the opportunity to watch all the action from various viewing locations around the Grand Prix circuit, have also been selling fast.

Despite taking place one week earlier than its traditional July date - in a bid to avoid clashing with the finals at Wimbledon - circuit bosses are expecting another capacity crowd. While three-day and single-day tickets are still available in a number of grandstands, the message from managing director Richard Phillips is a familiar one.

"To make the most of our 'Early Bird' prices, fans need to book their tickets before the 7 February deadline - or as early as possible if they want to guarantee seats in their favourite grandstand," he noted.

Tickets can be obtained via Silverstone's website or by calling 0844 3728 300.