Deducting expenses, self employed. (12 week contract abroad)

I am Self employed, UK national, resident in the UK and I have been offered a temporary work placement in Sweden in the summer. 1) What do I need to ensure I do before I go regarding HMRC? Or indeed, any such offer I receive of a similar timescale. 2) nothing is paid for by the company. I have to pay for my accommodation privately and I must also fund my transportation costs. I consider these working expenses that are directly related to the ability to work, exclusively. Do I have the right to claim these expenses? Thank you for assistance. Mr Smith

Hi Dalito Smith,
Please refer to guidance here:
Expenses if you're self-employed.
If anything is in fact paid by the company, add this as income to your turnover to then claim the expense.
Thank you. 

It's because I didn't find anything specifically related to rent paid abroad that I asked for help. I have looked through that copy-paste link. But it's focuses on people working in the UK with a small section on overnight trips as travel expenses. I need to reiterate, 3 months rent, paid my myself. I'm not sure how I might reword it more clearly.

Hi,
If you are still unsure after reading the guidance, you will need to contact us direct on 0300 200 3300.
Thank you.

I'm certainly not "unsure about reading" the guidance. You have avoided my case entirely. I'm more unsure about the validity of this service. I don't need links and numbers I already have. I need someone to bother to read what I am saying. "unsure about reading" is a micro aggression and sloppy work.

Hi Dalito Smith,
We cannot give advise on specific or hypothetical scenarios hence why links are given. if you need specific advice you need to contact HMRC direct on 0300 200 3310 or engage the services of a professional. 
Thank you.