A Hull Pixelbot needs a pixel. The clue is in the name. Actually, having played around with it for a while, I think it needs a lot more pixels. I started using the 16 pixel rings but I found these both easy to destroy and rather pricey. An expensive combination. So instead I've tracked down these 12 pixel rings on AliExpress. They are slightly larger than the 16 pixel ones, they have fewer lights (the clue's in the number folks) but they work very well.
And you can get five of them for eight pounds 17 pence, post free from China. Result. Mine arrived last week. Unfortunately I wasn't at home at the time, so they were sent to the Post Office parcel depot for me to pick up.
In "The Good Old Days" (tm) the depot was on the side of the Post Office where I live, so I could have my parcel after a short walk. Today, thanks no doubt to "the total commitment of the Post Office to a quality parcel delivery and collection experience for all its customers", the parcels must be picked up from a depot which is a thirty minute drive away, with a tiny car park and, from the postcodes I heard being given by the folks ahead of me in the long queue, serving the entire city of Hull.
If the Post Office is in any way concerned about losing its parcel business then this is exactly the way to go about it. Nothing wrong with the two poor folks serving the queue of about 20 people that had accumulated by the time we got there on Saturday morning - they were making the best of a bad job, but only a person powered by a spreadsheet could have come up with such a stupid and inconvenient "improvement" in the way I get my post.