It's a capa, definitely not fila.
You need an advice from UK based peers, like Dazza is.
In the US ~3" capapretum goes for anywhere from $50 to $120, LFS or online.
Since you're not a vendor, you don't possess the same exposure, so to sell it timely you could try to offer it for the same price you bought it. But you may get lucky too and get twice more, as Dazza said.