Blimey, that's a bit steep!!!! That's the price I'd expect a DIY'er to have to pay.
What are your qualifications? 'Cos I've got a part P qual. and 17th edition, my local LABC's (Wolverhampton, Dudley and South Staffs) class me as a competent person who can raise a cert. for the work carried out. Wolves and Dudley therefore charge £30-40 for a notifiable job. They don't get off their arses to do a site visit - money for old rope for them. For Wolves, I must send a photocopy of my qualifications in with the notification and Dudley just want a copy of the cert. when the work is done. South Staffs want around £120 per notifiable job, so I'm avoiding them till I'm on a scheme!