Investing With Advice
You should always seek help from a professional financial advisor, who will give you advice on the best investments for your situation. With your consultation they will be able to work through the factors affecting your decision, including what you need from your investments, the funds you have available, the differences between the available options and the outlook for the different sectors available.
Depending on the type of financial product concerned, either the law or non-statutory codes of practice may give you certain rights and protection when you use an adviser and act on their advice.
Investing Without Advice
If you are prepared to select your own investments, either shares or investment trusts, you can choose either to go direct to a stockbroker to buy the shares for you, or you can approach a fund management or investment company and invest in a 'wrapper' product such as an ISA.