Yeah I've seen that issue. The model on the cover was an AMT/Ertl one that you could never get to look that good until your skills got better! I've actually been working on one of those too... Should post some build pics of it soon!
Airfix came out with 2 DW kits... the Tardis and a Dalek (that wasn't too well received even thou I thought it looked good). The Dalek was from an episode of DW called Daleks in Manhatten and was opened up to reveal what they actually look like. So I guess that may be why. I know I have also seen the Dalek Davros that was done awhile back by another company but they are rare and expensive if you find them!