Waste of time. A person (not you, but A N Other) could use the voucher then take their spending elsewhere. I did once persuade Amex to post a voucher the day after my spend hit £10k, rather than 3 weeks later at the next regular statement date. That was already a concession (and a helpful one as it enabled me to snag the only 2 rewards seats on my preferred date) but I had at least spent the £10k. In your situation I would be finding ways to bring forward some regular spend. In the case of the recent 10x bonus with Lloyds, this meant buying several £750 Sainsbury vouchers.