The strict requirement is that UK NARIC has confirmed that the qualification was taught or researched in English. Formally this is done via a letter from UK NARIC stating that the degree was taught in English http://ecctis.co.uk/naric/individuals/C ... sment.aspx
. However, some people have put their degree through the PBS Calculator again and if it still awards the English language points, print off this as proof that the it satisfies the English language requirement (along with their degree certificate). The latter option has been successfully done by others on the board, but it's at the discretion of the case worker to accept it.
Alternatively, you take an English language test as set out in the Booklet.
See pages 11-16: http://www.ukba.homeoffice.gov.uk/sitec ... let_an.pdf
Whilst I understand the assumption that UKBA would keep a record of it, from what I understand, some degrees have been taken off of the PBS Calculator wtr to awarding English language points so it's best to provide the evidence that your degree does qualify.