Preparations for the 4,000-strong annual Two Castles run between Warwick and Kenilworth are well under way.
The event, which raises around £100,000 for charity each year, will start at Warwick Castle at 9.00 am on Sunday June 12 with the winner expected at Kenilworth Castle just over 30 minutes later.
Organisers Kenilworth Rotary Club and Leamington Cycling & Athletics Club, said all 4,000 places had been snapped up within hours of the online registration going live despite a disruptive cyber attack on the registration process.
Rotary press officer Bob Kelly said: “The Two Castles is one of the best-loved athletic events in the Midlands and is both for serious runners and for those who run for sheer enjoyment, or for charity.
Each year it grows in popularity and attracts entries from all the country.”
Leamington law firm Blythe Liggins is sponsoring the run for the 11th year and will be fielding a team of about 30 runners, manning a water station and providing marshals.
Richard Thornton, joint senior partner, said: “Kenilworth Rotary Club has done an amazing job yet again.
It’s a wonderful event and the whole firm always looks forward to taking part. We are extremely proud to have been supporting it for so many years.”
The cyber attack on the Two Castle’s registration website took place at the beginning of March causing anger among would-be entrants.
Entries for the popular race were postponed until the next morning.
But huge demand left the site flooded as hundreds of runners logged on at the same time - resulting in a frenzy - and only some were able to register.
In a statement, the Rotary Club said: “We have no idea why we have been the victim of such an attack unless it is someone’s idea of twisted fun.
“We would like to apologise to all who have been inconvenienced by the situation which has been totally out of our control.
“Normally we register 4,000 runners in around three hours without problems.”