@blackhall my experience is that I sent 3 letters signed for to withdraw my app that arrived 21/4. I’ve had a call today from a lovely lady saying she is withdrawing my application as of today. She even call me back to confirm she’d done. I love her and I told her that!
It’s a risky strategy withdrawing an application apparently and I dithered for 2 weeks before I sent my letters, 3 of them, I was given conflicting advice from all angles. Eventually I decided I needed to take back control of this situation, if it didn’t pay off then it was my fault. I had 7 weeks till holiday when I sent letters and booked a fast track for the 16 may. I fly on the 4/6.
I’m not advising this route just giving you my experience. I read someone on Facebook who said she’d sent 15 letters and none where opened. It’s a bit of a lottery. Good luck.