Season 1 Remastered DVD and Blu-ray edition coming to the UK in June!!!
Sometimes UK has all the luck. But lucky for me, I have a region free Blu-ray player.:
https://www.amazon.co.uk/Terrahawks-Complete-First-Gerry-Anderson/dp/B01CA3XEDO/
http://networkonair.com/shop/2456-terrahawks-the-complete-series-1-5027626451547.html
https://www.amazon.co.uk/Terrahawks-Complete-Blu-ray-Gerry-Anderson/dp/B01CA3XEAC/
http://networkonair.com/shop/2455-terrahawks-the-complete-series-1-blu-ray--5027626805340.html