Munton's is definitely an under-sized packet. those packet sizes are why you see some recipes stating to use two packets, especially older recipes.
now the smart companies are doing 9-13g packets which is a big benefit to us.
munton's yeast is better than using bread yeast, but when I used to get kits with it, I'd always swap it for some Saf-Ale.
Primary: English Mild
On tap: Pale Ale, Lancelot's Wheat, English Brown Ale, Steam Beer, HoovNuts IPA
Bottled: MOAM, Braggot, Raspberry Melomel, Merlot, Apfelwein, Pyment, Sweet mead, Cabernet
Gal in 2009: 27, Gal in 2010: 34, Gal in 2011: 13, Gal in 2012: 10