Mr Gardiner said if importing low-quality woodchip from Poland, Belgium or Denmark where there is infection up to 80%, then “it is unlikely that you are going to get non-contaminated, low-grade woodchip”.

The risk was much higher than moving the fuel around the UK, where the infection rate was much lower by comparison.

Dr Steve Woodward, plant pathologist at Aberdeen University said, “There is the potential for young shoots that have been put into the admixture of chips and chipped up themselves to carry the infection so if the material was coming in the correct time of year which would be June to September and if that material was contaminated and should it be left lying around anywhere where it was of suitable humidity where it could produce the fruiting bodies then that’s when it presents the risk.”