Kan dela med mig av svaren jag fick, om någon skulle vara intresserad;
Thank you for emailing the City of London. Unfortunately street trading - eg. singing music etc, is illegal in the square mile ( City of London Council ). Other surrounding Councils do allow street trading, such as Hackney, Islington and Tower Hamlets.
Street Performance on the streets of Dublin City is currently under review and it is envisaged that a code of practice will be introduced over the next couple of weeks by the City Council for all street performers. A permit system or fees have not yet been introduced. Designated areas are being identified as well as "no go areas". I would advise that when you know you will be travelling to Dublin, please contact this office again and we can update you on the position.