Looks like a common problem with Pug 206s, as you will have porobably seen by now from your own searches (I assume you DID at least try a few). Took me a couple o fminutes to find these:
http://www.honestjohn.co.uk/forum/post/?t=84272
http://www.peugeot206cc.co.uk/viewtopic.php?f=4&t=226&sid=6290cf12a256d529e7456c5b6bc22753&start=30
http://www.bba-reman.com/auto-mine/peugeot/206_engine_problems.htm
http://www.peugeotforums.com/forums/206-35/peugeot-206-2003-1-4-slow-acceleration-109722/
http://www.peugeotforums.com/forums/206-35/peugeot-206-2003-1-4-slow-acceleration-109722/
http://www.ecutesting.com/peugeot_206__306_1_4_litre_ecu.html
XXX
December 2015