Why Mr Walkley couldn't just send them an email, I don't know. As ever, no opportunity is wasted when there is the chance to squander your cash. Does Mr Walkley think his staff are so thick that they only get it if the message is spelled out on an 8' high billboard.
Sadly comments reaching the Barnet Eye indicate that Nick's bright idea have backfired. Staff have been sniggereing, nudging one another and saying "Did you see Nick Walkley's huge erection in the corridor". Barnet Council has been transformed in to the set of Carry on up the Council. You couldn't make it up.
I don't know who is in charge of communication at Barnet Council, but they'd be better off employed advertising Whelks on Brighton pier.