How does the pricing system of degrees in England work?
Most UK Masters degrees are a single year.  Even if for some reason you get an extension (e.g. to finish your dissertation), you will only be charged tuition for the taught year, maybe a small fee for remaining registered.  But the International fee will just be it (unless you are from the EU, in which case the home fee is it), and normally includes any bench fees. 

Note the fixed tuition costs matters less for Masters students, but is a huge win over US degrees for PhDs – you normally only pay 3 years tuition even if you take 4 or even 5 years to finish.

A part time degree will probably take about twice as long and you will have to pay the fee for double the number of years.  If you are legally allowed to work in the UK, or you can telecommute to a part-time job in your home country, this can be a win.  Though keep in mind that the cost of living is very high in the UK and will probably exceed your tuition even if you are full time.

Anyway, UK universities are very keen to get Masters students, if you just email the contact for a university they will give you full numbers.