The government provide some really useful information about investing here:
https://www.moneyadviceservice.org.uk/en/categories/saving-and-investing
https://www.moneyadviceservice.org.uk/en/articles/should-i-save-or-invest
https://www.moneyadviceservice.org.uk/en/categories/planning-your-investments
https://www.moneyadviceservice.org.uk/en/articles/do-you-need-a-financial-adviser
The government also provide a really useful set of FAQ's about ISAs here:
Our actuarial background is really important to who we are. Find out more about actuaries here:
We are fully authorised and regulated by the Financial Conduct Authority:
And here are a few of our favourite Wikipedia articles: