Hope it's OK sharing this here. If you're looking to open an account to buy shares or an S&S ISA through Interactive Investor then there is currently a referral offer until 31st December 2016.
You will need to enter my referral code below in the promotion field when you open a Share and Fund or ISA account. Once opened, they will credit both our accounts with £30 of commission credit. This code can be used four more times (at the time of posting). Thanks if you decide to use it!