What to expect at Belgium GP: Verstappen fan invasion, return to form for Spa master Raikkonen

Team to watch: Mercedes

• The significant step forward Mercedes made at Silverstone indicates they should be especially strong this weekend. Germany's Auto Motor und Sport magazine published revealing data from the race showing how Mercedes' rivals, particularly Red Bull, couldn't compete with their high-speed acceleration at a track with similar characteristics to Spa.

• Lewis Hamilton heads to Spa having extended his points lead over Nico Rosberg. He still has an engine change penalty to take but the chances it will cost him the championship lead have dramatically reduced.

• Could Spa's notorious weather catch Mercedes out? Red Bull would certainly relish a spot of rain, but at present a fine and sunny weekend is forecast..

Also on the radar: Williams

• Williams have been Mercedes' most successful customer team since they first started using the three-pointed star's engines in 2014. However their crown is in danger of slipping. The team has admitted some of the upgrades it has brought to its FW38 this year haven't delivered the expected gains. Felipe Massa is not having a great season, scoring just two points since Monaco.

• Force India have turned up with a quicker car on several occasions already this year and taken two podium finishes to Williams' one. They are closing in on the Grove team in the championship.

• The Spa track demands good straight-line speed – a Williams strength – and strong aerodynamics for the faster corners – where Force India have an edge. With prize money as well as championship points at stake it's going to be a fascinating contest between these two teams in the second half of 2016.

And not forgetting: Spa-master Raikkonen