Lanan Racing pairing Alex Reed and Joey Foster will switch to a Ginetta G55 GT4 for the opening round of British GT at Brands Hatch on April 16-17.
The move comes as delivery of the Porsche Cayman GT4 Clubsports has been affected by delays. Delivery is expected before the second round of the season at Rockingham on April 30 - May 1.
The delay means Lanan Racing will now enter one car in the 2016 British GT Championship rather than the planned two.
Graham Johnson, team principal, said: "I'm very disappointed that Porsche has failed to fulfil on delivery. It's put us on the back foot for Brands Hatch and the rest of the season. Not having the car in time for the first round, let alone testing, means we have had a difficult time filling the second.
"Luckily we have been able to hire the Ginetta from Fox, and both Joey and Alex have had some miles in it. It's not the start we were hoping for in British GT."
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Photo credit: Alex Reed