Hello advice re which ticket to buy. 2 adults and 14 year old travelling from Geneva to Montreux in March 2024. Then 4 days later from Montreux to Milano (Italy). Do I buy a half fare travel card for 2 adults (approx CHF185 each), and then a ticket for each leg of the trip (applying the half fare option for the adults)? 3 months later we plan on travelling from Paris to London also and likely to travel through UK for a week but I am not sure if this is to be considered as part of the same exercise. Any advice appreciated. Thank you