Some British cloth insignia

I received a couple of British cloth insignia some times ago. Included were those 4 bullion patches depicted here. I did a little research and this is what I could find out so far:

2. probably based on the coat of arms of London? Broadcasting service?
3. probably a signal unit?

Am I right with calling these patches "Blazer" or novelty patches, not worn on uniform?

Thank you very much in advance!

These are probably blazer or school uniform.

Not military.