Can confirm the above is a well documented and very cost effective solution.
EDIT:
At home, that is, for anything we sell I use proper APs, ubiquiti are good if you need wireless for any substantial reason.
Here for business I DO share the household Infinity but have a dual WAN router with '3' 3G card and giffgaff on the laptop.
Also just started using EE 4G at the new workshop and have to say v.impressed, metal shed yet infinity like speed.