Veg indoors flower outdoors? help!

hello everyone my vegging girls under my 400w mh are outgrowing there room and i predict they will double in size when triggered to flower, Do you it would be ok to put a few outdoors to flower? and does anybody know when flowering triggers in the UK?
+ rep for help

Sure it's ok but be sure to acclimate them. The first day let them out in the shade for 3 hrs, next day 6 hrs in the shade , 3rd day 3 hrs in the sun, remainder of day in the shade. If you see excessive droop, put them back in the shade. I'm not sure when the UK is 12 hrs day daylight, should be real close.

EDIT : Here is a cool map of the daylight/nite bell curve. Look on the right you will see a way to enter the time. http://www.daylightmap.com/index.php

It shows London Sunset 19:40 Sunrise 04:30 GMT 15 hrs daylight still. Don't know when you will hit 12 hrs which will trigger flower.

cheers + rep

Depending on your latitude it will flower before 12/12 outdoors. I have plants flowering now and we dont reach 12/12 until september 20 something. Good Luck dirrtyd