@Entity
@Table(name="operators")
public class LpOperator implements Serializable{
 
  private int id;
 
  private String postCode;
 
  private String operatorName;
 
  private String operatorRegistrationBumber;
 
  private int operatorType;
 
  private Set<LpVehicle> vehicles;

@OnetoMany
@joinColumn("Key")
Set<Vehicle> getVehicles()
{}

For this you don't need a physical relationship from the database end. All you need to do is build this relationship among the entities.

Let me know if it works.

Select
lic_id,
lic_numb,
veh_id,
Veh_reg_no,
veh_no_passengers

from Licences

left outer join lictype on lty_id = lic_typ_id
left outer join clients on cli_id  = lic_cli_id_resp
left outer join vehicles on veh_id = lic_veh_id

where lic_opr_id = 5

#opr_id = 5

@Entity
@Table(name="operators")

public class LpOperator implements Serializable{
 
  private int id;
 
  private String postCode;
 
  private String operatorName;
 
  private String ward;
 
  private String operatorRegistrationBumber;
 
  private int operatorType;
 
  private Set<LpVehicle> vehicles;
 
  private Set<LpLicence> licences;

  public LpOperator() {
  }

  @Id
  @Column(name="opr_id")
  public int getId() {
    return id;
  }

  public void setId(int id) {
    this.id = id;
  }

  @Column(name="opr_registration_number")
  public String getOperatorRegistrationBumber() {
    return operatorRegistrationBumber;
  }

  public void setOperatorRegistrationBumber(String operatorRegistrationBumber) {
    this.operatorRegistrationBumber = operatorRegistrationBumber;
  }

  @Column(name="opr_off_postcode")
  public String getPostCode() {
    return postCode;
  }

  public void setPostCode(String postCode) {
    this.postCode = postCode;
  }

  @Column(name="opr_name")
  public String getOperatorName() {
    return operatorName;
  }

  public void setOperatorName(String operatorName) {
    this.operatorName = operatorName;
  }

  @Column(name="opr_type")
  public int getOperatorType() {
    return operatorType;
  }

  public void setOperatorType(int operatorType) {
    this.operatorType = operatorType;
  }

  @Column(name="opr_type")
  public String getWard() {
    return ward;
  }

  public void setWard(String ward) {
    this.ward = ward;
  }
 
  @ManyToMany(
      targetEntity=LpVehicle.class,
      mappedBy="vehicles",
      fetch=FetchType.EAGER
  )
  @JoinTable(name="client"??,
   Dont know what to put here       
              )
  public Set<LpVehicle> getVehicles() {
    return vehicles;
  }

  public void setVehicles(Set<LpVehicle> vehicles) {
    this.vehicles = vehicles;
  }

  @OneToMany(
      mappedBy="operator",
      targetEntity=LpLicence.class,
      fetch=FetchType.EAGER
  )
  public Set<LpLicence> getLicences() {
    return licences;
  }

  public void setLicences(Set<LpLicence> licences) {
    this.licences = licences;
  }


  @Override
  public boolean equals(Object obj) {
    if (obj == null) {
      return false;
    }
    if (getClass() != obj.getClass()) {
      return false;
    }
    final LpOperator other = (LpOperator) obj;
    if (this.id != other.id) {
      return false;
    }
    return true;
  }

  @Override
  public int hashCode() {
    int hash = 3;
    hash = 53 * hash + this.id;
    return hash;
  }
 
 
}