What (a) number of official international trips is (i) she and (ii) her deputy planning to undertake in the 2019-22 medium term expenditure framework, (b) will the (i) destination, (ii) date, (iii) purpose and (iv) number of persons who will travel with the delegation be and (c) is the detailed breakdown of the expected cost of (i) flights, (ii) accommodation and (iii) any other expenses in each case