Absolutely S-Works. The Welsh Government can only legislate on specific areas set out in the devolution legislation. Doesnt include airspace.
GA WAS illegal under section 6 of the Coronavius Regulations as it was not an exceptional circumstance nor one of the 'reasonable excuses' listed in 6 (1) under that section. The CAA merely clarified it to allow for maintenance. It is now legal to travel unimpeded throughout England for as long and far as you like for leisure purposes and GA is a leisure purpose.
Commercial and arial use of airspace was never exempted, merely allowed as the crew were permitted under section 6 as indeed were GA flights eg for going to work