- 49 Once again, the comment and recommendation made in paragraph 135 apply equally to the segregation unit at Larissa Prison. It is also recommended that lighting in the unit's cells be improved. Subject to the above, the unit's detention facilities are adequate for persons undergoing cellular confinement as a punishment or for the temporary holding of a prisoner who represents a control problem (and the delegation was informed that these were the only types of situation for which the unit was used). 140. None of the segregation units visited kept a formal register setting out full details of persons held in the unit: date and time of entering and leaving the unit; grounds for the detention and destination on departure; cell occupied; etc. The CPT recommends that such a register be established in every segregation unit. It is also recommended that all cells in segregation units be equipped with a call bell and that a member of staff be always present in such units when they hold prisoners. 141. Finally, it should be emphasised that the mental and physical state of all prisoners subject to a measure of cellular confinement must be the subject of particular attention. It is provided in the Code of basic rules for the treatment of prisoners that prisoners placed in a special cell as a punishment or under Rule 94 shall be seen daily by a doctor. For its part, the CPT considers that whenever a prisoner held in cellular confinement, irrespective of the reason for that measure, requests to see a medical doctor - or a prison officer asks for one on his behalf - such a doctor should be called without delay to examine the prisoner. The results of the medical examination, including an account of the prisoner's mental and physical condition as well as, if need be, the foreseeable consequences of continued confinement, should be set out in a written report to be forwarded to the competent authorities. The CPT recommends that the Greek authorities take all necessary steps to ensure that the regulations and practice in this area are in accordance with the above requirements. d. complaints and inspection procedures 142. Effective grievance and inspection procedures are fundamental safeguards against illtreatment in prisons. Prisoners should have avenues of complaint open to them both within and outside the context of the prison system, including the possibility of confidential access to an appropriate authority. The CPT attaches particular importance to regular visits to each prison establishment by an independent body (eg. a board of visitors or supervisory judge), empowered to hear (and if necessary take action upon) complaints from prisoners and to inspect the establishment's premises.