To check on the status of any GRID site, and particularly RAL-LCG2, query the GOCDB2 (Grid Operations Centre Database version 2)
@ https://goc.grid-support.ac.uk/gridsite/db/
Look here for overall configuration, Ip addresses, contact names and sheduled down time.
For an overview of all sites:-
@ http://goc.grid.sinica.edu.tw/gstat//index.html
Follow links to individual sites to see performance details.