Deadly Pins Lead to Wins!

In my latest club game against Basingstoke this evening, my opponent made an oversight with 5.Bg4? I had this position before in a game, or very similar and failed to capitalise! In this game though, Black ekected not to capture the Bishop on f7, with a potential plan to 'self-castle' and instead decided to position the King on d7? This led to the 'Royals - his and her majesty' getting pinned thoughout the entire game. There was really no escape for the King in the final resignable position ...