Lights, camera, taxation

My client is a self-employed camera operator whose home is in Glasgow. However in the near future he will be working for six weeks on a TV programme in Edinburgh. Due to intensive working hours including night shoots and early morning filming it will necessary to stay in Edinburgh but the TV company will not be paying any expenses and my client intends to rent accommodation as it will be cheaper than a hotel. Will the costs of renting — rent heat and light insurance etc. — be an allowable deduction?
The costs are wholly necessarily and exclusively etc.
I have spoken to a technical HMRC Officer who has quoted the case of a publican staying on the premises and not being allowed to claim those costs. On that basis he does not think my client's expenditure...