I don't think that this is true..

300ft is 91 metres.

Sounds a bit unusual. 300ft would be roughly the height of the current max in Cardiff I would have thought. I\'m not a fan of height for it\'s own sake. Some people seemed to think the Admiral building would have been better if it was taller and narrower. I think it\'s fine as it is. Forget this \'international feel\' guff. Build what is necessary. If someone had a plan for 400ft and it looked okay I wouldn\'t have a problem. 50/60 storey in Cardiff would seem unnecessary.

You can find the Council's Tall Buildings Supplementary Planning Guidance on this page and there's no mention of such a policy.

https://www.cardiff.gov.uk/ENG/resident/Planning/Planning-Policy/Supplementary-Planning-Guidance/Pages/Supplementary-Planning-Guidance.aspx

If there is such a policy as mentioned in the opening post, I've never heard of it.

Well, there you go. If Barden hasn't heard of it, it can't be true!

I remember hearing the same thing many years ago i think late 90's around the turn of the millennium. Maybe it was a policy never implemented or from further in the past.