It's worth just noting that a 2 year comparison will not 'fit' every mortgage - eg Northern Rock currently have a 4.49 2 year fixed rate at 4.49%, but it only runs to 1/3/08, so it's not really 2 years.
The True Cost over 2 years calculation will include 6 months at the standard rate - about 6.5, and as Loiuse says above, you'll remortgage at the end of the fix.
So, on the one hand the true cost will show a higher figure for this very low fixed rate than you'd expect and it will be placed further down the league table than maybe it deserves. On the other hand, it is a very short product and may be unsuitable anyway.
If a product like this interests you, you just need to do a manual calculation.
Good luck