maybe they didnt want to giv it out to just anyone then i dunno
But that is the idea of the yellow vouchers they are for anyone and nowadays people do not need to be on benefits to have a voucher.
The advice for vouchers all branches received:-
Neutering is the only effective way we have of restricting the number of unplanned kittens being born - becoming the unwanted cats of tomorrow. While it is always a better use of our limited resources to neuter a single female than to foster, feed, treat, care and find good homes for its offspring, please use your experience and judgment when issuing these vouchers.
1. These Yellow (variable value) Vouchers are to be used in place of cash or the Branch veterinary account for most of our neutering work.
2. Please always use them to cover the full agreed cost of neutering all the cats which pass through CP Branch and Foster care.
3. Issue them for kittens that are re-homed before being neutered and for adult cats that are homed intact for any reason.
4. Use them when assisting with feral colonies and multi-cat dwellings (in these cases two vouchers can be used for the whole group; simply enter the number of male and female cats involved and the total cost in the value box). If your Branch does not have the funds to cover the cost of these group neutering situations, then prior to committing to help, please call the Campaigns Department for advice and approval of spend (we have a limited central budget to assist with this work).
3. Yellow Vouchers should also be used for Branch neutering campaigns where you wish to fund more than the standard Pink and Blue Voucher values. Please do not print your own.
6. These Yellow Vouchers should also now be used by Branches which in the past subsidised or topped-up Pink and Blue Vouchers, or paid for operations on privately-owned cats directly via the Branch veterinary account or locally produced vouchers.
7. Eligibility. Yellow Vouchers may be issued to anyone in genuine need of our financial assistance, this includes students, anyone in receipt of means-tested benefits and those reliant on pensions or low wages. However, if, in your opinion, the cat would not be neutered if we did not help, then please do issue a voucher. They may also be used to assist other reputable feline welfare groups (should the need arise). Our only priority is to reduce the population of unplanned, unwanted and abandoned cats in the UK.
There is of course the normal Blue neuter vouchers value £20 and the Pink spay vouchers value £26.
I have never asked anyone for proof of benefits as I am only interested in getting cats 'done'