I had this done recently in D7 - got ESB box moved that is. It took the ESB about 10 weeks to complete - so get your "order" in asap. Their systems are the pits! Ring throiugh 0800 number "I need box moved, have cert, etc"... your put on system 1 - it sends you an invoice within 10 days. When recieved you need to send a POXY cheque to Galway, can't use a card - thats way too modern!! Cheque clears 5 days later and your now on system 2!! Eventually you get onto a worklist - system 3 and as far as I know there is no priority. I never figured out how you are meant to get to the top...During this process you'll make numerous calls and be on hold for hours being bounced around from dept to dept. During one of these calls I got the name of the head "worklist" chap. During another call I got his mobile number. I'd ring daily (we were quite pally on the phone - Howaya John, watch the match last night etc) I quite literally begged for my box to be moved - tbh I was close to offering him cash in hand for himself if it got done....got a call one Friday - we can do it on Monday at 10am. 2 lads turned up at 11am had it done in 45 mins..
At least I'm not bitter about the whole experience
Cost was 350 odd - can find out for sure if required.