There are several types of Scroll Saw blades - as far as I know all of the 130 mm. (5")
The Post Code you give is very probably for Solent Tools who sell Performance Power spares - perhaps if you called them they might confirm the length.
023 8057 8057
They wil not be able to help you with the type of blade - that's your decision...
With the exception of blades made for very light duty saws, typical scroll saw blades are five inches long. The major types are:
Skip tooth (or single skip tooth) which have a tooth, a gap, and then another tooth;
Double skip tooth (two teeth, a gap, then two teeth);
Crown or two-way, which have teeth facing both up and down so that the blade cuts on both the down-stroke (as with all other blades) and the up-stroke;
Spiral blades, which are essentially regular flat blades with a twist, so that teeth project on all sides;
Metal cutting blades made of hardened steel;
Diamond blades (wires coated with diamond fragments), for cutting glass.
Good Luck..., October 2016
