I would add "and an equal share of your joint estate is below £254,000 (or current inheritance tax limit) and you have separately operable joint bank accounts" .. then don't make a will at all. The second is to avoid problems with delays if one partner dies and the money is in a single account of theirs. If the first is not true, you definitely need to take proper advice on inheritance tax. My parents didn't and the chancellor had £40,000 he shouldn't have had and need never have had *if they had done it properly*. IANAL usual disclaimers etc.
More important (often) than a will, in your circumstances, is life assurance for one or both partners. Should one die the other would need to pay for child care, whicever it is who dies and what the circumstances are.