is this normal guitar electronics cable?

It's not exactly the same but it's perfectly ok for electric guitar wiring where you don't need a shielded cable. The "miniature" one is thinner than both the "normal" one or the one from Stewmac, but given the currents flowing in an electric guitar circuit, it's more than adequate. "Twin" means that it's two parallel wires together, like a regular two-core mains or loudspeaker cable, for example, but thinner. You just split it and use each half as single wire.

It's always worth checking the prices of things like wire, toggle switches and jack connectors in places like Maplin, Farnell or RS, they're generally much cheaper than in specialist guitar suppliers, there's usually a bigger choice and what they have is not only perfectly adequate for guitar use, but also, very often, exactly the same stuff.

 

For example, a DPDT on-on mini-toggle switch:

WD Music Products: £6.20 (http://wdmusicproducts.co.uk/Mercha...e=wduk&Product_Code=WDE9&Category_Code=SWTCHS)
Farnell Components: £2.59 (http://uk.farnell.com/jsp/endecaSearch/partDetail.jsp?SKU=151168&N=401)

 

"Figure 8" means it's of the first type you mention. A small cut between the two wires at one end and you can easily separate it by hand.