Re: Transfer of undertaking
Your employer may be correct in what they are saying. Legislation around TUPE(Transfer of undertaking of permanent employees) applies only when there is, for example, an outsourcing of an existing service to another company
If all they have done is sold the shares, then you are still employed by the same company(even though other people own the shares) and your terms and conditions of employment should not change. Might be worth your while asking your employer in writing that there will be no changes to T&Cs following the sale