Best valves for controlling mains cold vs low pressure hot?

[JoeA]

We are having a bathroom referb, and the plumber will most likely put those standard isolation valves you adjust with a few flat head screwdriver on the hot and cold feeds to the sink.

We will be having mains cold and low pressure hot from our vented tank going to the sink. Coming into a mono block tap with tails (I know this is terrible for low pressure).

My question is, is there an alternative to the standard isolation valve that would allow us to easily dial down the cold feed slightly so it balanced better with the hot feed? I've read about all sorts of different valves some of which are not designed to be halfway open like this, and others which are. Or am I overthinking it!

Thanks

 

[flameport]

My question is, is there an alternative to the standard isolation valve that would allow us to easily dial down the cold feed slightly so it balanced better with the hot feed?

There isn't, and even if there were it won't solve anything.
The problem is the high pressure cold will be dramatically higher than the feeble hot water. Reducing the flow by partly closing a valve won't change that.

. Coming into a mono block tap with tails (I know this is terrible for low pressure).

Yes, it's terrible and will cause problems 100% guaranteed.
This is why UK bathrooms traditionally had two separate taps, and older style kitchen mixers had two entirely separate water paths from the taps to the spout so any mixing was done as the water exited the tap, not inside the body.

If you want a mixer tap, hot and cold need to be at substantially the same pressure. This means replacing the hot water system with a higher pressure type.
It's no use having low pressure for both hot and cold, as with the majority of modern taps you will barely get a feeble trickle even when fully open.

 

[dilalio]

Feed the bathroom cold from the CWSC.
And get a twin shower pump.

 

[denso13]

Or am I overthinking it!

Yes, many homes have the same set up. Get low pressure taps and work with what you have.