Toyota and Porsche rolled out their new 2017 prototypes at Monza, Italy earlier this month. Both cars were impressively quick with Porsche taking the bragging rights, however, when the cars line up for qualifying in their new high-downforce aerodynamic packages all bets are off.
Hartley and co, as well as their teammates in the sister No1 car Nick Tandy, Andre Lotterer and reigning WEC champion Neel Jani, won't have it all their own way. Toyota's Mike Conway (with Kamui Kobayashi and Jose Maria Lopez) and Anthony Davidson (with Sebastien Buemi and Kazuki Nakajima) all looked quick at Monza and were just over a second off the pace of the leading Porsche.
"I cannot wait to get the season started in Silverstone," said Hartley in a statement. "Technically we had a great test in Monza and as a car crew, we feel ready for the fight.
"Earl has integrated well and also showed awesome performance in Monza. In Silverstone, we may see a different picture in terms of competition in the LMP1 category. We will see how strong Toyota are."
As it is always with the German manufacturer in particular, they are looking at the long game rather than a sugar rush this weekend. They have opted to use their low-drag aero kit for the first two races of the championship at Silverstone and Spa-Francorchamps in May. This will hand a slight advantage to Toyota over the weekend, but come later in the season things might just turn around.
"I think we can expect a very tight fight with Toyota this year," said Bamber.
"It was close in Monza but Silverstone is a very different circuit layout so we must get on track with our Le Mans aero kit and see where we are.
"I have raced only once in Silverstone. This was in the Porsche Mobil 1 Supercup and I finished on the podium. It was an amazing fight and so I have great memories of that circuit."
The changes in the rules during the offseason meant teams are only allowed two different aero kits all season, hence Porsche decision to roll the dice.
The other challenge for the LMP1 teams is the new tyre rule that reduces the number permitted to be used per race.
This will mean a lot of thinking will have to go into tyre strategy especially so when a set of slicks will have cope with 90 minutes of racing.