Kimi Raikkonen won't take part in the Young Driver Test after all, with Lotus confirming he will not run at Silverstone.
The Finn was initially schedule to sample the new Pirelli tyres on Friday, but the Enstone squad have decided to give Nicolas Prost another go.
Prost tested the E21 on Wednesday while Davide Valsecchi will take over on Thursday.
"Once details of what race drivers were allowed to do here became apparent, we would have only been able to conduct a very limited programme with Kimi," trackside operations director Alan Permane said.
"If we were to run him, it would compromise the other development work we want to do with the car here.
"By running Nico again we'll be able to build on the work already carried out and hopefully be in the best position to develop the E21 ahead of Budapest, whilst also conducting the necessary tyre testing for Pirelli."