The alternative is to hop off at ... any bus route that goes down Oxford Street — and there are a lot of them — will do the trick. TfL's Oxford Circus bus route spider map lays out the options.
To get to and from Sydney Airport (SYD), you can take a taxi, use shared ride apps, catch the 420 bus or hop on the Airport ... and whether you’re traveling off-peak. You can also use an Opal ...