I heard of giga plus fue offers from Harley street medical and they are ones to avoid. Maybe they got another branch in Glasgow with same offers and new name. Which is what a lot of these crap hair clinics do. Just checked they are linked to Harley street medical.
I also never heard of Dr Valvis. Can’t find any results of him from here, so personally I would avoid that. If you want to travel there are better doctors in Belgium, Spain, Portugal and Turkey. I know it’s tough travelling now. There’s also Dr Arshad in Leeds.