Porsche ace Phil Hindley heads the field for this years Tour Britannia (10/11 May), which starts from Warwick on Friday morning (10 May) and finishes back there late on Saturday afternoon (11 May).The ninth edition of Britains only classic race and rally tour runs will feature scrutineering and documentation on Thursday evening before two full days of competition. The most compact route so far lies in store for competitors in the Competition, Targa and Regularity sections. Fridays route takes in special stages at Arbury Hall, the Porsche Centre at Silverstone and Mallory Park. There will also be a race at Mallory Park and a special test at Gaydon. Saturdays route includes special stages at Packington Hall, Stoneleigh and Arncott, with double visits to Packington and Stoneleigh. Saturdays race will be on the Silverstone International circuit.Hindley and co-driver Andy Bull will campaign the immaculate 911RS from Tech 9 and Hindley is unbeaten to date on the event and its little brother, Mini Britannia. His established pace on the race tracks and emerging pace on asphalt rally stages make him the pre-event favourite, but a gaggle of crews are lining up to try and prevent Hindley completing a hat-trick of tour victories.The stand-out rival to Hindley in the Competition event is Morgan Plus 8 of Richard Plant/Leigh Sebba and Morgan is one of the only marques to have prevented a clean sweep of Porsche wins on the event. Plant will be particularly keen to capitalise on the Morgans pace during the race at Silverstone. Meanwhile, switching to a Ford Escort from his regular Lotus Elan is tour veteran John Sheldon, partnered by Richard Kirby. Also in an Escort, and likely to be a contender, is Mike Smith, who is co-driven by Peter Thomas.Stuart Scott and Steve Wood have a great record on the event with their ex-Richard Lloyd Chevrolet Camaro and would love to repeat their 2012 podium finish, while the pairing of Adrian Kermode and Sarah Bennett-Baggs (Porsche 911SC) will be very strong. More quick Competition entries include Jerry Bailey (Ford Escort Mk2), John Spiers (TVR Griffiths) and the strong pairing of Philip Walker and Howard Redhouse in Walkers Jaguar E-type.In the Targa category for post 82 cars, it is the Porsche 911 of Stephen Radcliffe and Peter Gunson that leads the way. Although running in a different section to Hindley, Radcliffe would love to be trading times in a sporting rivalry with his good friend.Finally, a glorious array of cars will line up for the Regularity section, where the emphasis is on timing consistency and navigation rather than all-out speed. The Lotus Elan of Melissa Raven and Jeremy Haylock should set the standard given their impressive record on the event.