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To enable me to answer your question could you please respond to the following using the same numbering:-
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If you are presently holding a 5 year multi entry visitor's visa then it is obviously a condition of the visa that you use it only for the purpose of visiting. This excludes work and therefore working in the UK would be a breach of a condition of your visa.
However, it's a bit of a blurred line - for example you could receive a telephone call about work, should you not take it?
IN the circumstances though, if it is to be meetings and a 2 week course then I should think that in order to avoid prejudicing yourself with respect to visits or applications then an application for a Business Visitor's visa would seem the most appropriate form of application. You can explain your situation in a covering letter to them, stating that you wish to ensure there is no possibility of you inadvertently breaching your multi-entry visa.
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