I'm afraid I'm no investment expert, but I suspect they would all tell you the same thing: It's impossible to know exactly what to recommend and suggest because that will be based on your individual circumstances: how long you wish to invest for, what risk you are prepared to take and what outcome you are looking for.
However, I can recommend a couple of avenues to explore. You can enter your details through the investments guide on this website which can be found here. The moneysupermarket.com financial team may be able to help you narrow down exactly what you're looking for.
Another option would be to consult an Independent Financial Adviser. They can look at your circumstances and recommend an appropriate investment plan for your lump sum. You can find one in your area by looking at: www.unbiased.co.uk - It's run by the industry body responsible for promoting independent financial advice in the UK.
Hope that helps.