What is the black tack Hornby use for holding wires in place?

[trainmania100]

Open up a recent Hornby model and inside youll see this sticky black stuff (like bluetack but stronger and stickier) holding wires in place

I need to route some wires around one of my models along the inside of the roof and I recon something like that would be ideal

Anyone know what it's called ? Would rather use that than glu gun or something

 

[Ken X]

Amusingly it's actually called Black Tack (Tac). Sold by various outlets such as Roads-and-Rails etc.