I was only really interested from a 'do I need to keep it' POV, I've been dealing with the actual Last Will for the last 6 months. We've only just been granted probate, things seem to be taking an age right now.
If you've been granted probate on a Will and no caveats have been lodged, there is no reason to keep older Wills. If there was an issue with the last Will that meant it couldn't gain probate, it might have been important.
Oh, as to your other question - if a beneficiary predeceases a testator then the gift might fail, or it might follow the family per stirpes. Depends on the gift and circumstances. A rewrite or at least a check is always worthwhile.
What do you mean by "scandalus" please? And what is the implication of that?
Also are you saying that a letter stating the reason for non-inclusion isn't worthwhile?
I know nothing about your circumstances so nothing I say here constitutes advice.
You need to understand that after someone dies a Will becomes a public document. Let's talk about the implications of this to a theoretical testator named Bob.
Bob has a son who he hasn't seen for many years after a disagreement (he loaned his son a huge amount of money to buy a house and instead of buying one rented a house and spent the money on flashy road bikes and cocaine). He writes a Will excluding his son, but if he included the actual reasons the son isn't inheriting then the reasons would be considered scandalous (as they would become public knowledge) and redacted from the Will prior to probate. What you would have then is a Will that excludes the son without saying why. This leaves the estate vulnerable to a claim claim under the Inheritance (Provision for Family and Dependants) Act 2005.
Best practice would be to include a clause along the lines of "X is excluded from my Will for the reasons stated in a letter written by me and stored with this my Will". This would be saved and read out at a court case if the court decided to claim. Scandal avoided, as the letter is still private after your death - if you choose to go to court you lose your right to privacy.
You can't stop claiming, but solicitors follow the money and the letter along with properly made case notes would make the chances of a successful claim very difficult indeed. If the solicitor doesn't think they will be able to earn their fees, they won't do the work.
There's even the possibility of vexatious claims, where there's little chance of winning and someone is taken to court just to cause nuisance. There's not much you can do to prevent this but that's extremely rare, because who would pay for it?
I'm certainly not commenting on the service you received one way or the other. It is a judgment call for a draftsman to make a decision as to whether that sort of clause is appropriate to a given set of circumstances. You really have to put your faith in the competence of the person who drafted your Will. It also means that if they haven't done their jobs properly you can fall back on their professional indemnity insurance.
Did I say it's immensely stupid to rely on a homemade Will?