If you are based in the UK and are awaiting your Google AdSense payment, you might have to wait a little longer. A Google Groups post from an official Google AdSense representative, Stephanie, said that due to Easter coinciding with the first payment processing day, payment will be delayed in the UK.
I've checked in with our payments specialists about your reports of not seeing any 'Payment in progress' links yet (especially for publishers located in the UK).
Because the Easter weekend coincided with the start of the March payment process, payments to the UK will be slightly delayed this payment period. If you're eligible for a payment, please be assured that it will be issued and details posted to your account by the end of the week.
Thanks for all of your reports, and we apologize for the delay.
You will receive your payments by the end of the week, and Google apologizes for the delay.
Forum discussion at Google Groups.