Addition to last post.
It seems the last couple of days, instead of working BRS-BRU-BRS, the BRS aircraft has been working BRS-BRU-EMA-BRU-BRS, both morning and evening. The BRU-EMA-BRU-BRS sectors have been delayed by around 2 - 2.5 hours. This seems to suggest that BM are an aircraft down, and just managing to sneak everyone in under the 3 hours time limit.