hi all. i have a kitchen ceramic tap valve ( Reginox) and a sink ceramic tap valve ( Twyford) that need both changing as they both leak. I have been on Lunns web site and i should take the valves out and compare them with their valves' pics in order to find the right ones. I wondered if any of you with more experience than me know what kind of valves i should get without having to unscrew them first. I attach the pics of both taps. Thank you for your help and time.