French, bustling doggedly around as fast as her weight will carry her, creates quite a few, endearing outbursts of sarcasm and seething irritation in the unlovely face of Maureen's complaints, but she cannot hide the fact that her undeveloped character is not much more than a mildly comic vehicle taken for a dull ride.
We are left to guess why Bernice has become such a self-sacrificial mother's girl and in what ways she has been damaged by it.
Maureen's gossiping, aimless chatter, her demand for news of school and life out there, which is all done in the borrowed style of one of Alan Bennett's female oldsters, may induce dutiful gusts of laughter from the French-Moyet loyalists in the first-night audience. It strikes me with all the comic allure of a dripping wastepipe in the night.
Possessive Maureen is larger than life, swollen to the point of ridiculousness in Kathy Burke's under-nourished production. Watson has perfected notes of nagging self-pity and querulousness, climaxing with regular demands to be shipped off to an old people's home.
Yet even when Moyet's Cath at last returns from abroad, any hopes of a dramatic clash between the sister who got away and the one who stayed behind are dashed by a predictable blow of fate.
In a comedy starved to the point of emaciation, of both incident and wit, it would be unfair to say anything about this. Smaller ought to run and run - fast, out of the West End.