I am just doing this in my property. Same set-up as you. Gravity hot water and mains cold.
Just ensure the taps you select are rated to 0.2 bar or less. It is a real nightmare finding decent looking taps that are properly rated to low pressure systems. Some say both but in reality are not made for low pressure systems, especially for hot water.
Taps that are quarter turn, rather than the traditional "multiple turns" are usually for high pressure systems, as are those with ceramic washers (from what I have read).
Also, ensure try to avoid flexi piping as this restricts the flow a lot. Look for the widest bore feed into the taps. I think the maximum for a mixer tap is 1/2 inch. I cannot find any larger for basin taps.
Also, check that you do not have any restriction valves on the pipes for each tap. These also have a reduced bore which can affect flow.
In my property I was getting very poor flow. 6l/min vs 18l/min compared the the same set-up next door. I traced the issue to all the things above combining to affect the flow quite dramatically.
These are the only decent looking low pressure mixer taps I could find:
http://www.bathandshower.com/taps/bath-taps/min.-operating-pressure/0.1-bar.html
If you look at the filters down the side, you can select the required pressure. I have gone for the lowest possible.
In the descriptions, these say spindle operated cartridge, rather than ceramic washer, which me think that they are the standard rubber washer type (easier to replace too). Some still look like quarter turn ones though.
This is the other site that helped with looking at low pressure system issues.
http://www.forest.plumbing/why-your-water-pressure-might-be-low-part-2/