Originally Posted by NWIFlyer

Assuming the result is announced on 15th, the union would then have to formally write to BA the following day giving notice, so the absolute earliest strike date would be 22nd (and more likely 25th or beyond because they'll want some time to consider their position to maximise impact).

If I wanted to inflict considerable pain on the company in terms of revenue hit, personally I would not strike between Christmas and the New Year when fares are generally a bit lower because the percentage of leisure travellers increases, so the value of refunds BA would have to offer would be reduced. I'd wait until business started up again in the New Year, so my money would be on the threat of action starting in the first or second week in January - which also gives some time to focus BA's mind into making a more equitable offer.