Delaying Tier 5 YM Visa

Hi Everyone,

I'm due to enter the UK on my Tier 5 in a month but my circumstances have changed and it's now looking like I will no longer be able to make the move.

I understand that you can delay the entry date by up to 3 months for a fee but my issue is more regarding reapplying for a visa in the coming years.
If I were to not use my visa to enter the UK, would this be a red flag when applying for it again in the future?
Should I be alerting someone that I won't be using the visa?

Sorry if this has been answered elsewhere but I've trawled through the last few years posts.
Thanks in advance!

I'm in a similar situation, and I've also scoured the internet for answers. Nothing seems concrete (there is a definite lack of info on this topic), but in your best interest, I would suggest cancelling the visa just in case. Check out this link: https://www.gov.uk/cancel-visa. It does say that you can cancel your application...I'm not sure if it makes a difference if your application has already been processed, but I would give it a try anyway. Let me know if you find more information about this. Good luck!