Want the lawyer - legally evict my tenant

Information
Rent place : SE13 6QF
Rent term : 6 months (27Oct2021 - 27Apr2022)
Rent rate : 1,500£ per month
Rent Payment : 1 month unpaid
Documents were sent to tenant :
1. Formal demand for overdue rent - sent email on 10 Mar
2. Termination Of Tenancy Notice - sent email & registered post on 1 Apr
The reasons : 1. delay payment 2. Tenant behavior (speak rudely and no respect to landlord)

Need lawyer service for Possession Proceedings and Eviction 1. Issue Form 6a 2. Apply for the court order
Could you quote your service charge, please?