What was the change in the total amount of fees payable in 2019 from 2018?
{"": {"2019": "\u00a3m", "2018": "\u00a3m"}, "Fees payable for the audit of the Company and consolidated financial statements": {"2019": 0.1, "2018": 0.1}, "Fees payable for other services: --  the audit of the subsidiary undertakings pursuant to legislation": {"2019": 0.2, "2018": 0.1}, "Fees payable for other services: -- Total": {"2019": 0.3, "2018": 0.2}}
total_fees_2019 = df["Fees payable for other services: -- Total"]["2019"]
audit_fees_2019 = df["Fees payable for other services: --  the audit of the subsidiary undertakings pursuant to legislation"]["2019"]
answer = total_fees_2019 - audit_fees_2019