Holiday entitlement

[hero22]

This topic has been discussed in various ways but I need advice before I take things further.
Issue is that in my office holiday requests have been / are being rejected continuously supposedly because of sickness levels. I’ve been in this office for 5 years and have been along with everyone else forced to carry leave over year after year.
Yesterday I requested a print out of owed hours and it totals 6 weeks from past 4 1/2 years.
My question is and I’ve spoken to the union and got no where, are Royal Mail allowed to do this? We get told these hours have been banked and you will get paid them when you leave the company. If I can’t use them am I entitled to request payment for them now if they can’t be used? Any help is appreciated or even who would you raise this issue with ?

[ihatedogs]

https://www.gov.uk/holiday-entitlement-rights" onclick="window.open(this.href);return false;
Scroll down and read the disputes section mate.

[hero22]

Cheers mate