Insurance, financial affairs, monetary affairs and real estate affairs; including -services relating to financial or monetary affairs comprise the following: banking services including exchange brokers or clearing services; services of credit institutions other than banks including co-operative credit associations, individual financial companies, or lenders; services of investment trusts and holding companies; services of brokers dealing in shares and property; services connected with monetary affairs vouched for by trustees; services rendered in connection with the issue of travellers' cheques and letters of credit; hire- or lease-purchase financing; services of realty administrators of buildings including services of letting or valuation, or financing; services dealing with insurance including services rendered by agents or brokers engaged in insurance, services rendered to insured, and insurance underwriting services