Friend cancels plans last minute all the time

Cut him off, if he doesn't even have the decency to let you know then he isn't worth keeping around.

Have you asked them why they tend to cancel things very last minute, as opposed to further in advance?

I suffer from depression and anxiety and often end up cancelling things at or near the last minute because I've been mentally preparing myself for the few days running up to it, but find as the time comes up sometimes my anxiety will overwhelm me, or I'll I spiral into a depressive episode, and I am thus unable to go out. While I try and maintain commitments whenever possible, sometimes it just becomes too much, and I have no other option but to cancel. It's not a case of being callous with respect to my friends' time and commitments, and the feelings of guilt afterwards often make any anxious or depressive states last that much longer.

As such I'd encourage you to discuss it with them a bit more, and if they brush it off as a joke, try and gently press the matter. It may be they are dealing with some stuff currently you aren't aware of, which may make their absences and cancellations more understandable.

That said, you aren't obligated to continue making time for them, and sometimes if there is no reason (or sometimes even if there is) it's best for your own benefit to just go your own way. I would suggest that you leave the door open for them, in that case (unless there are other issues at play), but perhaps stop putting in as much yourself and let them make the effort to arrange things and meet you on your level of engagement.

His excuses range from I broke my leg (Yes this was actually an excuse) which was told to me about 20 mins before we were meant to meet and he done this a few days prior. I have to do sometimes at university so I can’t make it.

From the way he does act he is very extroverted and one of the last people I would think to have anxiety. He is just lazy tbh