If you make use of the AstroGrid system or tools available through the AstroGrid workbench, we would be grateful if you could acknowledge this use in any resulting publications. You could use these words:

'This research has made use of data obtained using, or software provided 
by, the UK's AstroGrid Virtual Observatory Project, which is funded by the 
Science & Technology Facilities Council and through the EU's 
Framework 6 programme'

Use of any data discovered or accessed through AstroGrid should of course be mentioned as noted by the data providers.