Remove that tin-foil hat.
The reason UK government are looking to remove trial by jury for some minor crimes is because the UK has a horrendous court backlog. It is not uncommon to have to wait a year or more for your day in court.
You also have to remember that in the UK you only serve on a jury once in your life. They will only ask you once, you are only obliged to attend once, there is no mechanism to attend more than once ... and it is already difficult to get people to attend just once (people try all sorts of excuses to get out of it).
Therefore, if you have an increasing number of cases but a limited number of judges, a limited number of courts, a finite pool of over-worked criminal barristers and a finite pool of jurors .... Eventually you're going to have to start making hard decisions.
Of course its not ideal. Of course in an ideal world everyone would have trial by jury. But it is what it is.