So,Requirements for leave to remain wrote:(c) An applicant who has, or was last granted leave as a Tier 2 (Intra-Company Transfer) Migrant must:
(i) have previously had leave as a Tier 2 (Intra-Company Transfer) Migrant under the Rules in place before 6 April 2010, or in the Established Staff sub-category under the Rules in place before 6 April 2011,
(ii) not have been granted entry clearance in this or any other route since the grant of leave referred to in (i) above; and
(iii) not be applying to work for the same Sponsor as sponsored him when he was last granted leave.
1. If a Tier 2 (ICT) migrant was issued leave as a Tier 2 (Intra-Company Transfer) Migrant under the Rules in place before 6 April 2010, or
2. If a Tier 2 (ICT) migrant was issued leave as a Tier 2 (Intra-Company Transfer) migrant in the Established Staff sub-category under the Rules in place before 6 April 2011,
then switching is allowed.