There should be only two sources of 'official' condolence letter received by the next of kin of those fallen in battle; a short, formal letter signed by the Sovereign and a longer hand-written letter from the man's platoon or company commander or c/o. Neither will ever be held accountable by next of kin for the particular circumstances of the death.
I'm not sure when this fad for politicians writing letters started, but let's hope it stops. All politicians are liars, many are venal and corrupt, many are incompetent. Not a class of person from whom a grieving widow or mother would welcome a communication. Add to that an entire government and opposition front bench without a campaign ribbon between them.
Brown's savaging at the hands of Mrs Janes may strike many as unfair, but it arose from his own hubris and vanity in penning the damn thing in the first place. Let's hope this inappropriate letter writing ceases.