No mention of skates at all on the UK list here:
https://www.gov.uk/hand-luggage-rest...orts-equipment
Then again skating probably is not a major sport here (hope that doesn't offend) so they simply have not made the list.
However as I understand it airport security managers are free to some degree to add their own restrictions, and I think it could be down to the opinion of whoever does the screening on the day. Looking at the list on the same website detailing workers tools you'll see most of which are a "no" in hand baggage. comparing and contrasting the likes of blades and chisels with the structure of skates and TBH I think you'd at the very least end up with a discussion over getting them through as carry on.
Edit to add: Not sure who the OP is flying with but just found this, scroll down to "Objects with a sharp point or sharp edge", penultimate item on that list.......
https://www.easyjet.com/en/terms-and...angerous-goods