Yes indeed, which is why I raised a concern about that particular trap. I think the design is a great idea but just make sure the central cage is big enough for the bird and for a perch, food and water.
The General Licences for ENGLAND (For example WML-GEN-08) have the following footnote.
Under section 8 of the Act, it is an offence for any person to keep or confine any bird whatever in any cage or other receptacle which is not sufficient in height, length or breadth to permit the bird to stretch its wings freely.
I'm note sure what the equivalent legislation is for Ireland.
A