In a normal year, the service receives a combined total of 750 enquires. But in autumn 2012, the UK saw multiple cases of chalara, a serious disease of ash trees which is caused by the fungus Chalara fraxinea.
Since then, THDAS has received over 4000 enquiries from England and Wales alone (as well as approximately 200 from Scotland), a workload ten times higher than normal.
That massively increased workload comes as the service struggles with budget cuts introduced in the years leading up to the 2010 election.