Welshpool is currently unlicenced but I am fairly sure it is still open. It is unlicenced due to the current operators 'Pool Aviation' have been forced to relocate due to tenancy problems.
Pool Aviation will be out by the end of the month, to the best of my knowlege the airfield is then being re-licenced and expanded by the owner.
I think you can still contact them on their usual number.
Try
www.poolaviation.co.uk for more info.