Large (not) cheque received in post

I closed a savings account before Christmas, withdrawing the princely sum of £1.51 to do so. I was surprised to receive a cheque a few days later for the outstanding balance of ... wait for it ... one penny.

It must have cost more than that to print it, let alone post it to me.

I'm pleased, of course, that Santander was determined to pay me every penny it owed me, but could it not have sent me a text message suggesting that I called in to collect my money or it would be donated to charity?

Now, given that it hardly seems worth the effort to pay it in to my bank, what do you suggest I do with the cheque?