Many estate agents in the UK refer clients to a Conveyancing lawyer. There is nothing wrong with this practice so long as it is based on the professionalism and expertise of the Conveyancer . If you don’t know a Conveyancer then this referral may be helpful to you.
Keep in mind that your Conveyancing Lawyer is there to protect your interests and if you would prefer to select your own conveyancer then you can refer to the Council of Licensed Conveyancers for a referral or check the web for a conveyancer of your own choosing. While there is usually nothing wrong with the agent referring you to a Conveyancer you need to feel comfortable with it and it is your choice not the agents as to whom you use.