The Love She Sought (1990, Angela Lansbury, Denholm Elliott)

Retired schoolteacher (Lansbury) retires to Ireland and seeks out the man she's been writing to. Footage at the airport includes a Mercedes 608 midibus and an unknown Duple coach:
Dublin is full of double decker buses, including Bombardiers:
Lansbury travels on Dublin Bus KD29 (ZJL29), a 1981 Bombardier GMDD: