Do you think £112 a week is enough to support 2 people in the uk?

Depends how many hours a week your sponsor works and how much money your sponsor gets paid
Normally they start cutting your income support as soon as you earn money
Sponsors are normally working people with jobs not people on benefits

I would imagine that the immigration department at the British Embassy in Manila would take a great interest in the fact that your sponsor is not even working.......................