Heres details in finnish but the dates and %s can be easily deducted

I am on my phone so too much to retype for me

chat GPT translation:

Do you need more Avios for your next trip or a higher level?

Buy or donate Avios from February 19 to March 5, 2025, and earn up to a 40% bonus on Avios.

Act quickly to access the best bonus rates – the rates change on February 24!

When you purchase between February 19–23: - 6,000–10,000 Avios, earn a 30% bonus- 11,000–99,000 Avios, earn a 35% bonus- 100,000–200,000 Avios, earn a 40% bonus When you purchase between February 24–March 5: - 6,000–10,000 Avios, earn a 20% bonus- 11,000–99,000 Avios, earn a 25% bonus- 100,000–200,000 Avios, earn a 30% bonus

For example: If you purchase 150,000 Avios on February 21, you will earn 60,000 bonus Avios, but if you purchase the same amount on March 2, you will earn 45,000 bonus Avios.