Is the lV price in london and Paris the same as stated on their local website page ?
Will be flying to london then paris. If i make my purchase in paris shld i claim them in paris too since i wan to get the cash refund asap or shld i get to london for VAT refund ?
Yes price is the same as what you see online.
You will not be able to claim your tax in Paris, when you fly to London as right now London is still within EU.
Only flights out of EU you can claim.
Basically you can only claim all your tax refund at the London airport if that's your final port of departure back to Singapore.
It will be cheaper if you purchase in London though, due to current exchange as Euro is slightly up.
Tip - DO NOT get cash for your tax refund in London, they do not give in Pounds, and will only allow tax refund in either Euro / USD or SGD, and you will lose out a lot because of their shitty exchange rate even though they claim they do not charge fees for cash payout instead of credit card.