We were actually travelling HEL -> LHR - > MAN with the HEL -> LHR leg paid and the LHR -> MAN on points.
I was expecting to be able to check our bags all the way from HEL to MAN but was prohibited from doing so in HEL.
As there was loads of time in LHR and bags to check in, we didn’t bother with OLCI.
Also, just did another search, no pre-flight e-mail either. This must clearly be some anomaly because there are hundreds of others in my deleted mail folder.