My 5 year old 43000 mile TA uses negligable oil between changes, which I do annually, so about every 8000 miles. I've had it from new, and although I drove it fairly gently for the first few hundred miles I did give it the odd hard burst.
Some modern cars do use oil. There have been various reports regarding VAG cars on the Honest John website, mainly 1.8 and 2l TFSI engines. VAG's stance is that consumption less than 1l per 500 miles is acceptable. Apparently running them in too gently causes the problem, so I don't know if the TA engine can suffer similarly.
Re. the Twingo, my neighbour tells me he has to undo four hand screws in the boot to lift the engine cover to get to the dipstick. Ironically, it doesn't seem to have the dashboard indication like other Renaults I have had. Mick, with your Clio try pushing the computer button while "Oil OK" is being displayed, and it should change to a row of dashes and zeroes that indicate the level. I still used to use the dipstick on mine occasionally, but a skeletal hand would have helped!