You could just ask them. They speak brogan English.

What's all this aboot?

Loads of different answers to this depending on how old you are and where you're from.

One suggestion is that it signals the end of mandatory military service.

Guys conscripted would complete their national service and on leaving boot camp were allowed to keep their boots (makes sense i mean what would the army want them back for ? 🤷)
As something of a metaphorical f-you, those leaving would toss them over the nearest telephone wire knowing it would give the camp a headache evertytime they had to remove them if phone lines started to go kaput !

Years and years ago it was rumored that shoes flung over a phone or electric wire were flags that drugs were available to buy close by.

Maybe it’s a seminar.

That tree has a lot of sole.

Dr. Who trip momentos.

It could be a cobblers convention and they have to leave their boots at the door because it's slippers only indoors. But that could all be a load of cobblers!

Shoe trees are expensive. Only the rich have them.

Us kids in the ghetto use the power lines to store our shoes. See included photo

Peaceful demonstration by the Doc Martin preservation society

Some moneys worth of dockers there

Haven't you heard of shoe trees? Lol :)

@Ironicman 😆only in the united kingdoms what a lot of cobblers lol

Hmmmm stumbled upon a parallel universe?

Someone doesn’t like red boots???

No one knows.

One things for sure buying multiple same shoes must have cost the person a fortune.

What does the sign say?