Pauline Quirk got hers for services to young people, to the entertainment industry and to charity’. She runs the PQA Trust charity to support underprivileged children wanting to train in the performing arts.
Gaynor Sullivan (as her name appears in the Honours List), a.k.a. Bonnie Tyler, was given the award simply for 'Services to music'. However her Wikipedia entry shows references to charity work, which might have swung things in her favour.