This is interesting - according to the AVA now, while the SCRS is back in place (now called the Stray Cat Sterilisation Programme - though if it sounds like a duck, and quacks like a duck.... :)) no caregiver has asked the AVA about it. This is rather strange as I know caregivers who have approached their TCs about it - because they were told this was the proper way to go about it.
On the other hand, since the AVA has said no caregivers have approached them, perhaps the best thing to do now is to write in and ask the AVA how you can be included on the programme. As the letter says, you can email or call - the email address is firstname.lastname@example.org as given in the letter. You may also want to copy the CEO, Ms Tan, at email@example.com and the Chairperson at firstname.lastname@example.org.