Jake, you are confusing two issues here. Sam Smith's are not withdrawing from live music because of the "impending legislation" (i.e. the new Licensing Act) they are saying it is because of PRS/PPL costs. Government are likely to respond to your letter by saying that they cannot get in the way of a business transaction (or not) between Sam Smiths and PRS. Surely any letters about this should go to PRS?