Mike, you are correct. It is Bristol Blenheim Mark IV, built in Valtion Lentokonetehdas and given to PLeLv 42 in April, 1944. Marking BL-200. It was operative in late Continuation War and in Lapland War and was mostly flown by major Kalle Kepsu, the commander of PLeLv 42.
It is currently at display at Ilmavoimamuseo (Air Force Museum) in Jyväskylä. More pictures ia a virtual museum:
http://ilmavoimamuseo.fi/virtualmuseum/ The Blenheim is number 24.
Finns changed the Blenheim original radios to FuGs, because ground stations were equipped with German radios and the British radios worked poorly with them. I have sources, but only printed and only in Finnish
This was quite hard, thats why I gave hints.
Your turn