Under the Solicitors Regulation Authority - Code of Conduct, Rule 2.02(20) states:
All clients affected by a material alteration to the composition of the firm must be informed personally. Where the person having conduct of a matter leaves a firm, the client in question must be informed, preferably in advance, and told the name and status of the person who is to take over their matter.
So that's a yes.
If you are not happy with how your claim is being dealt with, you are well within your rights to complain to the Legal Ombudsman or the SRA. In the first instant, the complaint should be made to your Solicitors. You should have received details of the complaints procedure in with your information pack when you first signed to them.
I hope that helps.