As ever with Pizza Express, the food was great for...

As ever with Pizza Express, the food was great for a reasonable price.
However, the service that went with it was shocking. We were there at a busy time (early evening), but our waiter was consistently rude. We were ignored for 20 minutes while trying to get the bill (odd given they were busy!) and then when trying to pay with vouchers, the waiter was visibly annoyed with us for the inconvenience we were causing him. He then couldn't be bothered to scan all the vouchers and just presented us for the remainder of the bill (the food portion of which could have been covered by the unused vouchers). Decided it wasn't worth the fight, paid and left.
I've been to a lot of Pizza Expresses and always had good and cheerful service. Such a shame when someone lets the side down like that.