There is no mandatory requirement as such to show return ticket, however, you would have to mention on your application form that the period you intend to stay in the UK during your visit.
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Yes you can purchase a one way ticket. There are several Low Cost Airlines in Europe such as Ryanair, Wizz, Germanwings, easyJet, Vueling, Norwegian - to name just a few. you don't say where you're starting from, but have a look at Skyscanner or Google flights and it will tell you which airlines fly that route.
Your identity document (for example your passport or identity card) will be checked when you arrive at a UK port or airport to make sure you're allowed to come into the country. It should be valid for the whole of your stay. You may also need a visa to come into or travel through the UK, depending on your nationality.
Proof of onward travel means that airlines and governments want to make sure you are not illegally immigrating to their country, so they need to see proof of a return ticket home. Basically, some countries want to make sure you aren't attempting to move there on a tourist visa and never leave.
U.S. nationals, including U.S. dual nationals, must use a U.S. passport to enter and leave the United States. U.S. dual nationals may also be required by the country of their foreign nationality to use that country's passport to enter and leave that country.
It depends on the country you are traveling to. Some countries require travelers to have a return ticket in order to be granted entry, while others may not. It's best to check with your destination's immigration policies before booking one-way tickets, as it could cause problems if you don't meet their requirements.
While skiplagging isn't illegal, American Airlines filed a civil lawsuit earlier this month against Skiplagged.com, accusing the company of unauthorized and deceptive ticketing practices and tricking customers into believing they've gained access to a secret loophole.
What is this? So while you can technically travel on a one-way ticket, they also need some kind of official return ticket confirmation showing that you are leaving the country eventually. They won't necessarily care where that ticket goes, just as long as it's out of their country.
FAQ 9) Are return tickets required with a valid visa? No. If you have a valid visa you are not required to be in possession of a round-trip or onward ticket.