Depends on whether he left a will or not. If not, depends on how much the estate is worth.
If he did leave a will excluding them, they may make a claim under the Inheritance (Provision for Family and Dependants) Act 1974 for "reasonable financial provision".
Yes factor. Scottish law has the law of legitim (legal rights) which allows for the relic's share (widow/er) and bairn's share. Although someone well versed in scottish law will have to answer how it applies cos I haven't got the foggiest.
I recall that Scottish Law distinguishes between moveable assets (eg money, stamp collections) and other assets (e.g. house). I think the children can be/are entitled to a share of the moveable assets under scottish Law. Is Scottish Law relevant steverennie- was your husband domiciled in Scotland?