TV Ident Additions

BBC2 Ident
BBC1 Ident + BBC1 Ident = BBC2 Ident
(combined with equal levels of transparency)

ITV Ident
BBC1 Ident + BBC2 Ident = ITV Ident
(combined with equal levels of transparency)

3.
Channel 4 Ident
BBC 1 Ident + ITV Ident = Channel4 Ident
(combined with equal levels of transparency)

Thank you William Richardson for making the maths add up!