It would help if we had more information, such as where you will be located, kind of job and position,company working for International or local and personal circumstances such as married, children.
To add what Captain Ron has said, at a minimum expect relocation allowance including flight cost, hotel while settling in, shipping of personal goods and cash allowance. Similar applies at end of contract to relocate back to UK, adequate health insurance, differential payment between UK and Philippine taxes (If Phil taxes are higher than you would have paid in UK, in most cases they are ).
Also would be expected is a rental allowance and if you have children education fees paid. Flights, insurance etc should also provide for family.
Depending upon your position you can also expect the company to pay for rental and utilities, domestic staff, car with driver, club membership, annual flights home for you and your family, pension, UK National Insurance, cost of renting property out in UK, Philippine taxes, adjustment for currency movements and a hardship allowance.
The rental allowance depends very much where your located, if you are in the NCR (Metro Manila) expect a lot higher than other places.
It goes without saying that you should read fully and understand your contract of employment. If you are unsure don\'t let the company say to you \"well this is how it is done in Philippines\"