I worked in NHS estates for 10 years in a managerial role. And what everyone else has said is pretty true. The vast majority of your work will be changing lamps, resetting MCBs, mite change the odd faulty switch. If you work in mental health you might b lucky enough to get damaged fittings and fixtures to replace. The rest of your time will be spent isolating circuits for contractors, hiding, looking busy and in meetings. If your from an installation role you will be bored!!
I'm back on the tools now, started a role 4 months ago in maintenance (pubs, hotels, restaurants) and I have never been so bored in my life. I'm looking to get back into installation.
On the positives, permenant role, hol pay, sick pay, pension, on call payments. Lazy life, easy life. Finish at 4.30 everyday or before. Only have to go to same place everyday. Maintenance appears to have been recession proof.
But don't think job for life it doesn't exist in the NHS anymore.