Your 12.5 years of service automatically transfer with the company and is not dependent on who owns it. However, if they desire, they can cancel your employment at any time by giving you the proper notice, pay in lieu of notice, or a mixture of both. As you mentioned, 8 weeks pay for your 12.5 years. Hope they give you more on top of that in a package.
I have never come across a clause which would reduce the basic rights listed above.
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