You don't have to go to court, as such, but you have to file the will for probate, to prove that it is legitimate. It is quite a straighforward process, but you will need to estimate the value of the property before you go, in case it goes above the inheritance tax level. If there is a house to be sold, you would need to get an estate agent to value it for probate, which would usually be lower than the market value. You would need to collect together details of bank accounts, life insurance and things like that, but I can't remember all the details. If you Google "Wills and Probate", you should find some helpful web sites. It's a few years since I did this, but it wasn't too difficult to do.
You may be interviewed, and if it is simple, it shouldn't take too long to authorise the will.
Good luck!