Using Williams Accumulation/Distrubtion or Chaikan Money Flow divergence. I use www.marketinout.com screener to find the companies. I also use technical insight from www.recognia.com (available from most brokers) The criteria: Companies with a peg factor below 0.75 preferable, strong trading statement, check market conditions for sector. I also prefer stocks which have had a volume spike (see rising on unusual volume at market in out), stocks which have upside breakout (use recognia technical alerts), another variation is stocks with accumulation but are undervalued (there is a screening criteria for this).
Big recent winners on LSE: qfi, tldh, vex, see, graphene nanochem, monitise, trx, Iae, tcm. If anyone has the code for use with amibroker please post.