thanks..
i found another one regarding the 6 month max stay..
http://www.ukba.homeoffice.gov.uk/polic ... 1/#header5
VAT1.5 Frequency and duration of visits
There is no restriction on the number of visits a person may make to the UK nor any requirement that a specified time must elapse between successive visits. However, the Immigration Rules state that the applicant must show that they do not intend to live in the UK for extended periods through frequent and successive visits. An ECO must consider the reason for a series of visits with only brief intervals outside the UK between each visit. The ECO must consider the purpose of the visit against the time elapsed between visits and the duration of previous visits to the UK.
There is no Rule that states a visitor can only remain in the UK for 6 out of any 12 months, but an ECO must examine the pattern and frequency of visits to see that it does not amount to de facto residence.
Occasionally, a business visitor may be required to stay for a period of weeks or even months (for example, where machinery is being installed or faults being diagnosed and corrected). However, the ECO should be satisfied that their presence in the UK on business does not amount to de facto residency and does not mean that he / she is basing himself / herself in the UK and holding down a specific post which constitutes employment and would therefore require the individual to seek entry under the points-based system.
thanks all
