Handbrake cable length for 98 4.5

[TimJM]

As part of my ongoing restoration I decided the handbrake cable must be replaced (it is so knackered that you can't even pull the cable through the sleeve when disconnected). I want to order a new one today but didn't measure mine last nigh once removed. It is a 98 4.5 and looked pretty long when I took it off last night so guessing the 122" not the 105" - is this the correct one:
http://www.racetechdirect.co.uk/tvr-car-part-j0179...

The short front cable looks in OK condition and does work (the cable moves easily through the sleeve) but is is worth replacing while I am doing the longer back one for an extra £25?

While talking about price does anyone know of a cheaper source? £82ish (once the VAT is added) sounds quite expensive for a handbrake cable. I guess it is the TVR tax.