Heater hose I.D. for TS?

[GTVeloce]

Anybody know the ID of the heater hose that runs between the heater tap (next to the clutch pedal), through the firewall and into the banjo at the end of the inlet manifold? Mine has sprung a leak and I would like to have the correct hose ready before dismantling it.
Thanks

[alanm]

I will have a look tomorrow and let you know.
Hopefully the banjo on the inlet manifold is easy to identify
Al