In our first two weeks with Panda, our bins weren't collected on the designated day (Thursday). However, it transpired that, due to a post-Christmas backlog, they were collecting on Fridays/Saturdays any bins that remained out on the road. Being civic-minded, we'd taken ours back in on the Thursday nights.
I rang their customer service line, and got through after about 8 minutes. A very helpful woman took my details and arranged for an emergency truck to come to our road last Saturday, and collect my bin and my neighbours'.
It was a black bin, and I think my repeated use of the phrase 'three weeks worth of nappies' might have made the critical difference here!