There is no need for a solicitor. The charge will be put and a plea then entered. The usual disposal for careless driving (unless it is a particularly serious example) is a fine and between 3 and 9 penalty points.
Before sentencing the defendant will have the opportunity to provide mitigation. Further, if the Bench is considering disqualification until a test is passed (as I described in my earlier answer) the defendant will be asked what effect this will have upon him. In these circumstances the services of a solicitor may be useful, but not essential. You should note that Legal Aid will not be available.
I must repeat that such an order should not simply be made upon the grounds of age alone. There has to be evidence that the careless driving was such that the overall competence of the driver is in question. This, of course, may be due to age but that should not be the determining factor. The definition of careless driving is �...that which falls below the standard expected of a careful and competent driver�. This can alleged of anybody of any age and it is the level of competence, not simply age, which shall be the determining factor.