Terminal spacing for 120-240V
0.7mm of clearance is pretty small.  If functional insulation is all you are really required to have from a primary to a primary, then 1.5 mm is sufficient.  

The online calculators at http://www.creepage.com/ are pretty faithful to the IEC (or UL if you prefer) 60950 specification, which dictates safety measures for Information Technology Equipment.

(edited from 1 mm to 1.5 mm.  I didn't take into account that the peak working voltage would be as high as mains voltage)