If you are new to Airbnb and signup directly on their site you receive no bonus credit, and in the past you received £15 bonus credit from a referral link. The Airbnb signup bonus has now increased to £25 for new members.
For those who are not familiar with Airbnb, they offer thousands of rooms in local accommodation throughout the globe, in over 190 countries, that can be booked fully online. They describe their platform as “a trusted community marketplace for people to list, discover, and book unique accommodations around the world”.
There appears to be no information on if this is a promotion for a set period, or is the new signup amount. I would recommend if you are new to Airbnb to create an account even if you have plans far in the future. Creating an account can be done in a couple of minutes and requires no payment information until you make your first booking. Sign up using the latest Airbnb promotion for £25 free credit.
After you have signed up to Airbnb through the promotion the £25 free credit will automatically be deposited into your account for use towards your first booking. You can then use this to book free accommodation as per this previous article. Depending on your appetite for adventure you could book this remote cabin in the hills of Columbia for free.