Dividend reinvestment (DRIP) as shares in a US company and Self Assessment

As a former employee of a US company I own shares and they are in a Dividend Reinvestment scheme. Four times a year a dividend is paid and shares are bought with the dividend minus the 15% withholding tax. My question is do these dividends need to be declared on a self assessment tax return (as income) even though the shares are still held in the US scheme? If so where do they get recorded? Also does this mean that when they are eventually sold I will be taxed again? Thanks

Hi Anne,
The dividend arising from the shares, is taxable and should be declared on a Self Assessment tax return as a dividends.
If you dispose of the shares for more than they were acquired for, then there may be capital gains tax to pay.
Thank you. 

Thank you.