I’m on a train going through Tooty Hill. Err I mean Rooty Hill.
If you are someone who wears a bra, and you had it fitted on the high street, there's a good chance you are wearing the wrong size! They use an outdated measuring system (Bravissimo are usually OK as they fit by sight, M+S, not so much).
Use this: https://booborbust.com
You might be v surprised; a smaller back size and bigger cup will be so much more comfortable!