Hi Hisham
I have the MAP 1/4 scale Miles Hawk Speed Six you are referring to. The accuracy of the plan is good. all wood fuselage with foam outer wings. You can obtain it from MAP Plans service(www.flyingscalemodels.com).
Other Miles plans can be obtained from:
PHILLIP S. KENT
32 MOORBOTTOM,
CLECKHEATON,
WEST YORKSHIRE
BD19 6AD
GREAT BRITAIN
who has 1/4 scale plans for Miles Sparrowhawk and Hawk Speed Six (version with reduced wingspan)

Good luck!
Ric 52