Query on Dependent Travel on Prevoius Tier1 Visa(post renew)

[trek]

Hi

My tier 1 extension PEO appointment is due for 2nd week Nov.
My existing tier 1 is valid till 5th Jan, this validity also applies to my Dependents.

Presently my 2 dependents (spouse and 4 yr old son) are not in UK (for some time) due to some personal family issues back in home country.

Following are my questions:

After I have applied for my extension in Nov 2012:
1. Can they travel to UK with their existing Tier 1 dependent Visa's (valid till 5th Jan 2013) which is based on my previous tier 1 .
2. Can they apply in person/post once they arrive in uk?
3. If so , and if applying by post can both send their extension application with 1 set of documents by post together.
4. If applying by PEO appt., I find only 1 applicant per login, how can I have 2 dependents going in together on same day.

Thanks in Advance.

Regards,
Trek.

[geriatrix]

Please continue in the existing topic.