Hi OP,
I was in a similar position as you also being in Scotland although I am a midwifery student, however, my friend works at disclosure Scotland.
You are correct, a category B offence is automatically removed from your disclosure after the 15 years have elapsed if over 18 or 7 and a half years have elapsed if under 18.
For the offences you mentioned as they are category B offences then they will come off your disclosure after the 15 years has elapsed automatically, there is no need to apply for a sheriff.
I think that previous posters are getting confused so I'm going to provide an example. Say in the case of your communications charge you got a fine - that is spent after 1 year of the conviction. Now although this will still show up on disclosures, by law you do not have to disclose it unless you are working in a place in which is a protected profession, in your case, social work.
So 8 years pass and you decide that you want to go in to youth work, this type of work would require a PVG, this means that since the time of 15 years hasn't elapsed this will show on your PVG but still not on a basic disclosure due to the fact that your disposal of a fine was spent after 1 year.
You would receive your PVG ten days prior to your employer and with your PVG would be a letter from disclosure Scotland that states,
' You can apply to a sheriff for removal of a 'spent' conviction or convictions appearing on your certificate. A copy of your disclosure certificate won't be sent to the person who countersigned your application until we know whether or not you intend to apply to have your spent conviction removed. Certain spent convictions are disclosed on higher level disclosures, as is the case for your current disclosure application. One or more of your spent convictions are eligible for you to apply to a sheriff for removal.'
Now you are being given this option as the 1 year has elapsed but the 15 year of automatic removal has not. You may apply to the sheriff for removal and they will determine whether the conviction is relevant to the type of regulated work. Many people don't do this though as it is very time consuming.
Should you decide not to apply for removal from a sheriff, once the 15 years have elapsed it will automatically not show on an enhanced disclosure or PVG, therefore you do not need to declare it after this time.
Certain jobs such as the police, certain criminal justice social workers, etc. have to undergo very enhanced checks and this means that things such as cautions will be available including spent convictions no matter how long that time has passed. As well as this, checks on your finances etc will be looked at to check if you are vulnerable to blackmail and the likes.
So for those types of jobs, yes you will always have to declare them as well as your convictions you received under 18 that were removed after 7 and a half years.
If you look at social work jobs in Scotland, you will see on the applications that most only require a PVG and so all that will show is you two convictions until the 15 years elapse.
I hope this makes sense, I too am unsure of what @RJnomore1 is speaking about. DBS and disclosure scotland are two separate organisations with different rules and regulations and has nothing to do with your question at hand.