I am a Pakistani student in the first year of PhD at a UK university. My PhD is funded by a scholarship from Pakistan which covers tuition fee and living expense of around 800 pounds per month. Are there any funding opportunities to top up my existing scholarship - top up for living expenses and top-up for mobility to provide opportunity to register and attend conferences.

Thanks in advance for any pointers, help and advice.

I'm not aware of any funding to top up your monthly stipend; though I assume your university makes some provision for travel and research costs through smaller schemes. (You'll need to apply for these on a case-by-case basis.)

Beyond that, try to get some teaching work and save this money for the inevitable spill over into a fourth year, at which point I assume your funding will stop. (I'm not suggesting you can't submit within three years, though you'd be the exception rather than the rule.)