Sakon Yamamoto has replaced Bruno Senna at HRT, not just for Friday morning practice, but the whole of the British GP weekend.
The news was confirmed by team boss Colin Kolles tonight, although he declined to be quoted officially ahead of any press statement from the team. He indicated that full story would come out shortly.
Senna is based in Britain and has a lot of fans here having done his early racing in the UK, so his absence will be especially disappointing for the Brazilian.
Yamamoto has done some Friday running this year, sharing the job with Christian Klien.