A CASTLE on Herefordshire's Welsh border which has been the home to numerous invaders during its near 1,000 year life is facing more unwelcome visitors.

Those taking on a major restoration of 12th century Hay Castle say the notorious Deathwatch beetle has taken up residence.

Tests are set to be carried out to determine the degree of internal damage caused by the beetles while structural engineers may have to be drafted in to determine what repairs, if any, are needed.

"One of the investigations currently being carried out is a study to discover if the notorious Deathwatch beetle is still active within the Castle’s oak timbers," said Clarissa Price from the Hay Castle Trust, the group coordinating the restoration work.

"The larvae of these tiny creatures eat through the timbers, weakening them and causing great damage.

"The Trust was aware that there have been Deathwatch beetles present previously at Hay Castle by the distinctive, large bore holes left in the oak timbers.

"But it was uncertain whether the holes were old, or if they were an indication of recent or current activity."

A monitoring programme using tissue paper to show up any new holes was put in place a few days ago to determine if there are live Deathwatch beetles at the castle.

"Since then, dozens of new flight holes have been observed," added the Trust member.

"The next step will be to determine the degree of internal damage caused by the beetles, as well as a treatment plan.

"A full condition survey investigation continues this month."

The Deathwatch beetle infests old oak timbers that have previously been affected by fungal decay.

They are known for making a tapping sound which is used to attract mates.

In May 2013 the Hay Castle Trust was awarded a £500,000 development grant from the Heritage Lottery Fund to carry out preliminary work needed to make a separate application for further funding.

Rick Mather Architects was appointed in January this year and is overseeing the preliminary activities and design work.

Despite the finds, the Castle has remained open to the public this week, while fundraising efforts continue.