If you need some help and advice on legal or family matters then often the first place to go is the Citizens Advice Bureau. The CAB is a free service offered to anyone and they will give you impartial advice on most matters. If they cannot help they will point you in the direction of someone that could. For example if it is advice regarding tax that you need then you may want to speak to the CAB first who will more than likely put you on to an accountant.
The CAB is often a very busy place so you may have to wait awhile to get an appointment or you may have to go in to the building and sit and wait to be seen on a first come first serve basis.
They do have a number you can call which is often the best way to speak to someone initially, but then they will often need to see you to continue helping you.