Employee Tax Relief for living accommodation and incidental costs

A client has taken a job in London. The job is at a single permanent workplace. He lives with his wife and family near Chester, so daily commuting is simply not feasible for him. He has rented a property in London and wants to know if:

1. The rentals can be claimed as an employment expense.

2. Tube travel to work from rented property can be claimed as an employment expense.

3. Train travel from Chester to rented property and back once a week can be claimed.

4. Subsistence meals can be claimed.

Can't find much guidance on HMRC site on this. Initially said to client 1. Maybe, 2. No, 3. No, 4. Maybe.

Can anyone help with a definitive answer?

Many thanks,