Thanks for your response
I fully understand your frustration that you go where the work is, which is not always on your door step.
But even for self employed people, accommodation and mileage does not always become an absolute tax free right, But the moment you provide that service to one company in one location you lose the right for HMRC to determine this to be temporary, it becomes permanent, regardless of where your registered office is situated.
So its not just the fact this is a two year (or beyond) position or that its choice, its the fact that this becomes, by default your main base of employment.
For example, if you were to be offered a job with that company (and had many other jobs on the go at the same time) and decided I can spare Monday Tuesday and Wednesday there but have another commitment with another job for Thursday and Friday, so could then offer the following Tuesday and Wednesday to the original job, these would all be treated as temporary - as you do not know from one week to the next where you will be, so all travel and subsistence falls within the temporary requisite.
This does not (and never has) fallen within that requirement - nor as an employee (which you are as well as a director of the limited company) get relocated within a contract which sees you away from home, on a temporary basis - you have that sole choice as director and employee whether to take that particular job on, and its location also falls into that decision made.
I am so sorry if you have been misadvised by your previous accountant - which is unacceptable, but I would certainly take the issue up with him/her for misinformation.
The 480 benefits guide and the Employment Inome Manual - link here is VERY clear on this matter.
http://www.hmrc.gov.uk/manuals/eimanual/EIM32150.htm the basic explanation of temporary
http://www.hmrc.gov.uk/manuals/eimanual/eim32160.htm this link showcases when there is a depot or other base which loosely summarises your position
Fixed workplace - which covers your position http://www.hmrc.gov.uk/manuals/eimanual/EIM32125.htm
This when the 24 month rule is over ridden - and this one summarises your position completely.
I am sorry the news is not more favourable. In these times we have to go where the work is, and it does leave you having additional expenses before you even earn from the job itself - it doesn't help businesses trying to thrive.
But I am sure you appreciate my role within Just Answer (and my own practice) is to be honest with customers rather than secure their business by telling them what they would like to hear only to pay the cost with HMRC later down the line.
Do come back if you have any follow up questions - it would be appreciated if you could rate/accept the response, so I am credited for the work I have undertaken.