I assume that you are your fathers only child as opposed to the only child from the relationship with your mother?
First thing is that there may be no Will. A very high percentage of people have no Will. He could have died intestate.
If he never remarried and you are his only child, then you are his next of kin. Therefore, if he died intestate, you are the only person entitled to get a Grant of Administration to handle his estate. As the only next of kin, you may also be the sole beneficiary.
So, there is a good chance that his estate/affairs are sitting there waiting for you as the only next of kin to sort them out.
You need to be a lot more proactive about this. You need to talk to his siblings to see if they are aware of the existance of a Will and/or can tell you who his regular solicitor is as they are also likely to know of the existance of a Will. If siblings/solicitor are unaware of any Will, and after searching through his papers there is no evidence of any Will, then you have to proceed as if none exists and start the Grant of Administration process.
In summary, the reason you may not have heard anything is because everyone is waiting for you as next of kin to sort out his affairs.