Capital gains (loss) on rental property that used to be main home

I owned a flat (originally as my main home) but which was rented out for approx the last 18 months before it was sold at a loss. Can this loss me used to offset either the rental income or other (non-property related) capital gains? If so can the full loss be applied or only a percentage (based on period of rental relative to overall ownership)

Hi
Please refer to the guidance: Capital Gains Tax: what you pay it on, rates and allowances