Paul Corfield wrote to uk.transport.london on Mon, 14 Mar 2005:

19 goes OPO on the 2nd April so all the last day specials will be on 1
April. Get your pictures and rides in now as it is rumoured the RMs
will start to be replaced by new deckers before the formal conversion
date.

They already have - not entirely, but you get the odd one stabled at
Brixton Garage overnight, and I have seen a couple of non-RM-19s running
empty to Battersea Bridge from there.
--
"Mrs Redboots"
http://www.amsmyth.demon.co.uk/
Website updated 4 March 2005 with a new photo