A regular 3 bed terraced house close to train stations rents on the general private residential market place for £950pcm to £1300pcm. You can easily convert this property into a 5 bed house share that rents to professionals for £2,250pcm (Gross rent with bills included)
Professional houseshares achieve higher rent on average than renting out to families.

This is because you would be renting out rooms individually to working professionals who will on average pay around £400 to £480 per room.
In Southend on Sea, there is a strong rental demand for professional houseshares from nurses, doctors, HMRC and airport staff. If your property is in close proximity to a train-station then your property could achieve the higher band of rental income.