Thanks Paul . I fitted the screen this morning without many problems . The credit card tip was really helpful in removing front cover . I fitted the brackets as I figured they would not include them if they weren't necessary . The left bracket drilled out and fitted easily but the other side was took about 1/2 hour to get the hole drilled in the right place , but all went well and total time taken was almost 2 hours . I reckon I could do another in about an hour .
A road test was then called for and it is really windy today so it was a good opportunity to se if buffeting was reduced and I am really pleased with the difference especially over 50 mph .
Thanks again to all the forum members for their invaluable advice . Ride safely Alan .