Hello Vikram, I think brass is nice with black personally and I would suggest wood for Windows and doors as UPVC does not add value to the home. You may never want to move but wood is lovely and really can't be beaten... Others may well disagree but I would never specify UPVC. With a wooden door you can then choose good locks.. Banham are best and they cater to Windows too but you can buy window locks online to suit the style of window ie sash or bay etc .. Have a look online and I'd say choose 1 finish throughout ! Also think about the other door furniture central door knob? , escutcheons, letter plate etc :))

So you know I bought a single 'click deco' brand dolly light switch a while back and found it to be pretty poor quality so it was returned. Ended up with these: http://www.forbesandlomax.com/the-unlacquered-brass-range.html Really good quality and they have lovely finishes too. I quite like their antique bronze range too as it contrasts nicely with chrome/nickel finishes without clashing. If you'd really like everything to match then take a look at the Jim Lawrence range. They're not the cheapest but offer both light switches and door furniture in a large selection of finishes. They also do the narrow style of light switches which I think looks really elegant in older houses. https://www.jim-lawrence.co.uk/door-window/door-handles-door-knobs/bromley-handle-with-bristol-keyhole-backplate-in-510201bw?returnurl=%2fdoor-window%2fdoor-handles-door-knobs%2f%3fcount%3d36 https://www.jim-lawrence.co.uk/1-gang-dolly-architrave-switch-in-chrome-with-3279chniz https://www.jim-lawrence.co.uk/2-gang-black-dolly-switch-bevelled-plate/

Depending on the colour of your doors, but I"ll go for the chrome perhaps!

We went for these in pewter. http://www.fromtheanvil.co.uk/handmade-oval-mortice-rim-knob-set-pewter-patina.html will post real pictures once we have painted the doors!