Below is a possible itinerary that encompasses various countries and experiences. Then I have discussed Malaysia in detail, and what might be good to do there.
London – Argentina – spend three weeks in Argentina First flight from around the world ticket
Argentina – Bolivia – three weeks in Bolivia
Bolivia – Peru – two weeks in Peru
Peru – Chile – ten days in Chile
Chile – New Zealand - one month in New Zealand second flight from around the world ticket
New Zealand – Australia – 5 weeks in Australia third flight from around the world ticket
Australia – Bali – 8 days in Bali
Bali – Thailand – 5 days in Thailand
Thailand – Laos – 10 days in Laos
Laos – Vietnam – 8 days in Vietnam
Vietnam – Cambodia – 7 days in Cambodia
Cambodia – Thailand – 6 days in Thailand
Thailand – Malaysia – 2 weeks in Malaysia
Malaysia – Singapore – 3 days in Singapore
Singapore – India – one month in India fourth flight from around the world ticket
India – Sri Lanka – two weeks in Sri Lanka
Sri Lanka – Nepal – two weeks in Nepal
Nepal – India – flies back
India – London return home fifth flight from around the world ticket.
This based on a round the world ticket costing £1000 and taking just under ten months to do it. As you can see it takes in many different places. It is designed with overland travelling in mind. This often cheap and cost effective and shouldn’t bump up the price too much.