I agree this latest strike would be the first launched in this country, let alone for UNite, without "protection" for some considerable time.
All employers have the right to sack strikers, without any recourse to be re-instated, even under a "protected" strike; it's only the amount of compensation for "unfair dismissal" which might vary.
Under unprotected action, no compensation for unfair dismissal is due.
More likely than issuing P45 will be a SOSR compulsion to sign, individually and within 90 days, the deal agreed by Unite last year (including protecting their current T&Cs and a pay rise) or be dismissed, without recourse to unfair dismissal compensation.
Hopefully by that time Unite will have its troublesome branch in order, or have formed another "branch" to develop a more productive framework for future industrial relations within BA, or it will have left its members sorely unrepresented.
Now, where are those accounts! 9 days to go!