There is a Lufthansa Cabin Crew strike, meaning only a couple of services on the Heathrow/ Munich route. The important consequence of this is that the BA flights are very full, many are completely full others only have limited availability. If you have a semi-flex BA ticket that permits free changes on the day and had planned to amend your return depending on how you hearing progressed, then you may want to ensure you have a late flight as a back-stop to ensure you gat back that same day. Availability will only reduce as time moves on.