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.”

Although there is no evidence of Chalara at the nursery, it has been banned from moving or selling the saplings as part of government action to prevent the spread of the disease.

A committee of MPs has now launched an inquiry to look at ash dieback and the way it has been handled.

Leader the inquiry, Anne McIntosh MP, told BBC Inside Out that Britain’s tree industry, which was importing saplings from Europe, needs to look at itself.

Simon Hart (Carmarthen West and South Pembrokeshire, Conservative)

To ask the Secretary of State for Environment, Food and Rural Affairs whether his Department requires trees found to be infected with ash dieback disease to be incinerated commercially or whether they can be used for domestic fuel.

David Heath (Somerton and Frome, Liberal Democrat)

Until further notice movement of all ash material off an infected site under a Statutory Plant Heath Notice is prohibited. We will review the measures for controlling movement of wood from infected trees once we have fully assessed the national disease situation. However, at the present time, the wood may only be used as fuel if it remains on the site covered by the Plant Health Notice.