Hi,
You do not mention where your parents are resident. If they are resident in Pakistan, then they have no UK tax implications.
If they are resident in the UK, then they may have a Capital Gains Tax liability arising from the gifting of the property to you. This would be declared in a Self Assessment tax return.
You, as a UK resident, would need to note the market value of the property at the time it was gifted to you, so that you can offset this against the disposal value, if and when you dispose of the property, as you may have a foreign Capital Gains Tax liability, which would be declared in a Self Assessment tax return. You can see guidance here:
Tax when you sell property
Thank you