he made the will in 1986 at the solicetors, thanks for getting back to me
In English Law a will is usually revoked if the testator, the person making the will, marries.
s.18 of the Wills Act 1837 is the relevant law.
However the will not be revoked if the testator makes a statement about his forthcoming marriage and says that his will should not be revoked by that marriage.
I'm assuming your father did not make any such statement. If that is the case then in law the will is considered revoked. In the absence of a will the law sets out how a persons personal estate should be divided.
This is something you should take advice on especially if there are surviving relatives. Somebody will have to apply to apply for Probate to settle his affairs.