Thanks for your response - and whilst I have expanded on how capital gains works - this was over and above your questions request - but as this is your first time on Just Answer, I have answered on this occasion
Then you will have to pay tax on this money In the UK through capital gains -
This is formed by the sale price less the acquisition cost - which forms the initial gain.
from this initial gain you can deduct the costs to buy and sell (such as legal fees) and also the cost of any capital improvements such as a new kitchen or bathroom.
Then tax reliefs are considered to take into account that this was your main residence - so the time you lived here plus the last 18 months of ownership/total period of ownership x gain forms the exemption and then you are due private lettings relief if you then let out the property and declared all rents to HMRC (this can allow a further £40,000 of relief)
Finally you would have an exemption of £11,000 and if then there is any gain left over this is charged at 18% or 28% or a mix of both (this is dependent on your level of annual income)
Then finally any capital gains you have paid on the Philippines can be used to offset against the Uk tax position
You should advise HMRC as soon as this sale takes place so they can set you up for self assessment tax (where you will complete a self assessment tax return) and you can then declare ALL income including this gain -
If you sell before 05/04/2017 - then you will complete a self assessment tax return after 05/04/2017 for the year end 2017 - and any tax due paid no later than 31/01/2018.
Do let know if I can assist further - on the information I have supplied