You will receive a share certificate, unless your shares are held in the CREST system in which case the shares will be credited to your CREST account or a Corporate Sponsored Nominee in which case they will be credited to the CSN account. You will also receive a purchase statement, dividend tax voucher normally within 10* working days of the dividend payment date.
Your new shares will qualify for future dividends in the normal way which will also be reinvested.
*Refer to company terms & conditions