Great wee archive and fantastic peace of engineering
Highland one is Forties Charlie two is Forties Delta these are now 40 years old and some 20 years still in this Jacket
Graythorp one and tow were Alpha and Bravo built on the river Tyne by Laing offshore 1973
If you watch the link you can also go on to the Ninian field and watch the Ninian central getting built from yard to heading out offshore fully constructed
worth a watch if you get the chance