All finished, and I thought that this was the easiest we've had for a while. However as is often the case I have a couple of stubborn loose ends that need tidying up.  Please can someone put me out of my misery and explain the following:
1. Where the first letter of the answer to 15d come from?  I can parse the rest of the wordplay but not that letter. 
2. Similarly for 19d I don't see where the first two letters of the answer come from. 
Thank you in advance!