Article 29 "You can apply to extend your stay for the maximum amount of time allowed for your specific sub-category".
The maximum length of stay in your sub category "Short Term" (ICT) is 12 months, You are then subject to a cooling off period of 12 months where you cannot return to the UK in the same category.
Article 29 would refer to (for example) If you were on a Long Term (ICT) you can extend after your initial 3years and 1 month(providing you pass English test) for a further 2 years bring the total Leave to remain to 5 years.
You could leave the UK and come back in under Tier 2 general possibly, depending on a number of factors.
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