Four main ticket resale websites have banned from "misleading" fans by not being transparent about fees in their advertised prices.

The Advertising Standards Authority (ASA) said Seatwave, StubHub, Viagogo and GetMeIn had not been clear enough about extra fees added at the end of the checkout process, such as booking and delivery fees.

Here are some tips and advice for buying tickets for concert, sports or other events online from secondary websites.

Secondary ticket agents source in demand tickets and then sell them on usually asking for substantially more than the original ticket face value.

Research the going rate for tickets as a guide to help you avoid paying excessive amounts.

Exchanges such as Seatwave, Viagogo and Getmein enable people to sell on tickets they have already bought, usually from official ticket sellers.

Individuals set the prices for the tickets, not the websites, so again you may find that you pay more than the ticket's face value.

Consumer magazine Which? advises anyone using a private or secondary ticket seller to be careful.

This is because it can be hard to trace your ticket seller if the tickets you receive are not what you ordered, or are fakes.

There is also no guarantee that secondary sellers actually have the tickets they say they do.

Although the ASA has ordered that in future total ticket prices on the four main resale websites should be made clear, this will not immediately effect tickets already onsale.

On top of the price of the ticket, extra fees and postage costs may also be payable.

Secondary ticketing sites have to tell you the face value of tickets being re-sold.

They also have to make it clear if there are any problems with sight-lines and if seats listed together are actually next to each other.

They also have to provide you with an email address in case any problems arise with the tickets.

If the ticket was originally bought by the secondary ticket seller from an official ticket agent, the official seller doesn't have to act on any complaints, as you did not buy tickets from them directly.

However, many secondary sites and fan-to-fan exchanges have consumer protection guarantees.