Where to put 30k (early retirement lump sum) for 20 years

[flyingfolly]

My wife has recently received ill health early retirement and has a lump sum of around 30k. Mortgage is paid off so we don't need the money for the next 20 years and she wants it to grow somewhere until she's 60/65.

What would be the options here? Throw it into Degiro into an ETF or Berkshire B etc.?

 

[Sarenco]

Do either of you have any room to increase your pension contributions/AVCs?

Could you carry out any upgrades to your home to make it more energy efficient?

 

[flyingfolly]

Do either of you have any room to increase your pension contributions/AVCs?

Could you carry out any upgrades to your home to make it more energy efficient?

Wife is retired now so don't think she can increase contributions as she's already drawing her pension? I'm self employed so throw as much into my executive pension as I can. We have done energy upgrades to the house already and have other savings if anything comes up.