I emailed this question to the Home Office:
and I received this reply:From: xxxxx
Sent: 27 May 2009 15:23
To: IND Public Enquiries
Subject: PEO appointment for ILR – dependents need to attend?
Dear Sir / Madam
I have an appointment at the Croydon PEO for an ILR application, based on 4 years HSMP under the recent judicial review. I will be applying for myself but also for two dependents (my wife, and my son aged 4 months).
Question – can you please confirm whether my dependents must attend in person with me, or not. I believe that they do not need to attend, and that I can apply on their behalf by carrying all relevant documents myself (for example, their passports). However, I would be grateful for confirmation of this.
Yours faithfully
Dear xxxxx
Thank you for your enquiry.
They are not officially required to come with the main applicant but you must bring their completed documents with you.
Yours sincerely,
xxxxxx
Immigration Group
UK Border Agency