father died left house in sole name to spouse of 60 years. is probate needed

my father had the family home registered in his sole name as was the trend some 65 years ago.  he was married to mum 60 years and they lived together in the home.  He left everything he owned to his spouse in a very straightforward will.

There is  not sufficient value to involve capitol gains or inheritance.

can the house be transfered to Mums name at land registry based on death cert and will or will we have to go to formal probate 

You always need probate in such cases as the property forms part of his estate and you need probate in order to then deal with it be that a sale or transfer to his widow.