This page spells out the price options for Travelcards covering the various combinations of zones.

www.tfl.gov.uk/tickets/faresandt ... /2911.aspx

You can also add on a child Travelcard for £1. I'd recommend a £7.50 zones 1-6 Travelcard + "kid for a quid" = £8.50 total. You can then go direct from Waterloo to Twickenham on a fast frequent overground service and also do any tube journeys you might need to make in Central London at other times of the day. Even if you simply need to get from Waterloo to Twickenham and back again an adult + child return fare is £11.90 according to the National Rail Enquiries website Journey Planner, so you'll save money by getting a Travelcard.

A Travelcard for any zone is valid on buses only in all zones, so a 1-4 Travelcard could still be used to catch a bus from Richmond station (Zone 4) to Twickenham, where the station in in Zone 5. Depends whether you think it's worth the hassle of getting off a train that will take you to Twickenham anyway and transferring to a bus for a slower journey in order to save £1.20

This page spells out the price options for Travelcards covering the various combinations of zones.

www.tfl.gov.uk/tickets/faresandt ... /2911.aspx

You can also add on a child Travelcard for £1. I'd recommend a £7.50 zones 1-6 Travelcard + "kid for a quid" = £8.50 total. You can then go direct from Waterloo to Twickenham on a fast frequent overground service and also do any tube journeys you might need to make in Central London at other times of the day. Even if you simply need to get from Waterloo to Twickenham and back again an adult + child return fare is £11.90 according to the National Rail Enquiries website Journey Planner, so you'll save money by getting a Travelcard.

A Travelcard for any zone is valid on buses only in all zones, so a 1-4 Travelcard could still be used to catch a bus from Richmond station (Zone 4) to Twickenham, where the station in in Zone 5. Depends whether you think it's worth the hassle of getting off a train that will take you to Twickenham anyway and transferring to a bus for a slower journey in order to save £1.20