Tax Liability on Private Company Shares

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I work for a private software company that has a share incentive scheme. There is only a nominal value assigned to this shares as the company is not floated on any stock market.
Recently a venture capitalist invested 10m in the company and as part of this the company was given an approx valuation.
I will soon be leaving the company and have a certain number of share vested.
The company is offering to buy back these shares on leaving at a unknown rate to me.
Do I have a tax liability to this and if so is it CGT?