The question was about Disability Pension. Incapacity Benefit is different and the rules are as follows for IB:
I go to live abroad or visit?
Let us know as soon as you can that you are going abroad. You can usually do this by contacting your Jobcentre Plus office or social security office.
If you are going abroad permanently, you may be able to get a benefit for incapacity if you are going to a country within the EEA or one that has a social security agreement with the UK covering incapacity for work.
If your stay abroad is temporary, you can get Incapacity Benefit paid abroad for the first 26 weeks if:
* you have gone abroad only for treatment of an illness or disability which began before you went abroad (pregnancy itself is not counted as an illness), or
* you were incapable of work for at least 6 months before you left the United Kingdom (UK) and have been continuously incapable of work since then.
You may be able to get Incapacity Benefit paid abroad for more than 26 weeks if your stay abroad is temporary and you get Attendance Allowance or Disability Living Allowance.
You may be able to get a benefit for incapacity in a country that has a two-way agreement with the UK. For more information, contact your local Jobcentre Plus or social security office.
For Disability Living Allowance:
To get Disability Living Allowance you must be in Great Britain, or be treated as living here, and meet certain other conditions about your residence and presence.