Styling Invoice Template with TAX Amount

[StormIT]

Hi,

I'm editing the invoice_items.php file, but I need to show the amount of TAX being charged for the total order.

Basically, an items need to show with no tax, delivery to show with no tax, but then in the TOTALS, I want

Total Product Price £VALUE(With no tax included)
Total Shipping £VALUE(With no tax included)
Total TAX £VALUE
TOTAL £VALUE(Of all three above)

Any ideas where I can get the tax value from? I can't see it anywhere!

Many thanks