Earlier this year my employer announced they were withdrawing our quarterly bonus scheme. They added 80% of our annual bonus potential to our basic salary for Apr- Dec and said they would pay bonus for Jan-March as previously. This resulted in a £1K pay cut for me. I looked into whether anything could be done about it as they gave insufficient notice, failed to consult etc. but eventually decided I wasn't in a position to push it. I expected to receive my Q1 bonus today. Last Wednesday we got an email saying that the bonus would be calculated differently, except it didn't point out it was different, just said how it would be calculated, and it is different. No explanation why. The bonus has been paid quarterly to the same formula for the 6 years I've been there. The result is that I am £500 short on what I would have received if they had paid 'as previously'. No notice, no consultation, the bombshell was dropped well after the period had closed. What would be my best course of action? I really feel they've gone too far now. I would be grateful for any advice.