Sorry for the late reply. I can point you to UK equivalents, but not to an actual french supplier. However i am sure they exist. they are all made in china anyway!
the key to look for is low ripple, and regulated. rs components do them in uk plugs, and may even do them with a european plug fitting. from experience, there is no difference to the actuall wall wart, and a simple travel plug adapter will work on a uk one, they normall run from a large voltage range eg 90 - 240 VAC - 9VDC Linear Regulated transformer.
Ariston RD11s, Zeta, AT31E, Stanton BA-26 Head Amp, Roksan Kandy MKIII Integrated, MKIII Power, Yulong DAH1 MKII HP AMP/DAC, Castle Eden, Yamaha YST-SW225, Sennheiser HD600.