The Howbery Business Park near Wallingford is now 99 per cent full after a clinical research company became its latest tenant.

P1vital has relocated from the Oxford University Department of Psychiatry at the Warneford Hospital to occupy a 1,600 sq ft office unit.

The firm, which employs 15 staff, is an innovative clinical research organisation specialising in experimental medicine studies and products to assess new therapies for central nervous system disorders such as depression, anxiety, schizophrenia and cognitive dysfunction.

Chief executive Dr Colin Dourish said: “We were attracted to Howbery Business Park because not only is it a beautiful place to work that will enhance our professional image when hosting our international pharmaceutical company clients and academic research collaborators, it also provides an attractive location for our employees.”

Howbery is the UK’s first solar-powered business park set within 70 acres of countryside on the banks of the Thames.

Park chief executive John Ormston said: “Providing a scalable approach to support our tenants’ business needs, including expansion as well as flexibility to downsize on occasion, has been fundamental in securing occupancy levels. I believe the key to our success is the community we have created.”

There is just one unit left on the park where facilities include an active social club, a crèche and even a boat.

Outline planning consent has now been granted for a 140,000 sq ft office building mirroring the existing building constructed for the Environment Agency.

Spaces will be available from 12,000 sq ft.