Those 4 shares will now be 40 shares. If you've received an email about selling yesterday you're allowed to sell 15% (up to 40max) at 13.18 a share -12.50 admin fee; so you could make £66.58.
If resolution passes then you'll be sent a cheque
Alternatively you can keep your shares and get a voucher for a 6-pack of vermont IPA in any brewdog bar or £10 voucher for online store