Just to add my 2p worth since I don't just want to be a lurker:
MS requires a certain amount of creativity and persistence. Once NS&I was closed I managed to redirect my spend through a certain P2P lender which was actually a far simpler process to NS&I however that route has now been closed as well.
I've been working my way through some prepay cards but no luck yet.
Reading the US MS is quite useful because it helps to generate fresh ideas.
Whilst I completely agree with non-disclosure of working MS leads I'm all for sharing useful clues, tips, ideas that will help others in their search for MS.