RFIG31110 | Residence for tax years before 2013-14: general information: counting days
From HM Revenue & Customs · Residence and FIG Regime Manual
This chapter only applies to tax years up to and including 2012-2013. From 6 April 2013 the Statutory Residence Test (SRT) applies. For guidance on the SRT please see RFIG20000 onwards.
Residence is not purely a matter of day counting. The number of days spent in the UK is one factor which needs to be considered alongside others.
When you are counting the number of days an individual has been present in the UK during a tax year you must include all of the days in which they have been in the UK at the end of day (that is, midnight), remembering that February has 29 days in a leap year.
Note: that the days of arrival in and departure from the UK for each visit up to 5 April 2008 are ignored (refer to EIM42840).
For example
An individual arrives in the UK on 10 June and depart on 12 June. This would be counted as 1 day if it occurred up to 5 April 2008, but would count as 2 days if it occurred from 6 April 2008.