No problem.
It is always a good idea if you are intending to fly at a specific location (especially if it is an historic landmark etc) to not only check airspace regulations etc but also look at that places website (assuming they have one). Also, check if there are bylaws in place + local council stipulations) or signs up prohibiting the use of model aircraft/RC aircraft etc. You don't want to necessarily call/speak to the council since they are mostly brain dead anyway and just say "No you can't fly" without qualifying the statement or understanding why that should be the case.
Although these types of locations do not 'own the airspace' above their properties, some (such as the National Trust) have bylaws in place which came into being when the land was gifted by the Crown to 'the people' and these do prohibit model flight (with the exception of gliders) above the land.
As long as you follow the CAA Air Navigation Order (which is law in the UK) and observe the required stand off distances as well as do your research at specific flying place you should be fine.
It's nice to see someone actively enjoying the hobby and when a mistake is made have the decency to step up and say 'Yup, didn't realise that... will learn from my mistake'

Obviously it's up to you whether you take the YT video down or not but videos like the one you have posted do give the CAA (local authorities now) evidence of breach of ANO rules and non compliant flights.