Hello, I'm Keith and happy to help you with your question. My sincere condolences on your wife's death.
9.2 appears the appropriate box to complete. Unless you wife's estate exceeds 325K, the point at which Inheritance Tax (IT) kicks in, then the whole process is an exercise in financial futility! Any part her estate which has been left to you [inter spousal transfer] or to charity is outside the 325K envelope in any event.
There is one point to note, though. Any of her 325K unused can be utilised in addition to your 325K allowance on your ultimate demise so you should keep a record for your executors or administrators. A bit gloomy, but a point to bear in mind. You win the National Lottery Roll Over just before you depart this life and everybody will be lapping around the residue!