Tom, Technically you need a performing rights licence to perform on the streets. Many player do not have a licence, but to be without one they run a risk of being caught. Fines can be high. You may also need the local councils permission, you should make enquires to them first. Some shop keepers object to playing outside there premises, so also check with them.
Regards Terry

I am about to purchase a street organ I am disabled but would like to play the organ on the street, can you please tell me if I need a license to do this.
Many thanks for your help.
Kind regards
Tom

In case anyone is following my conversation with Roger Belton, I HAVE managed to get an Ipad to play music on my 20 Note MIDI Busker in place of the Palm m515 system I normally use.
To connect to the Ipad I got a USB adapter from Amazon
- https://www.amazon.co.uk/Lighting-Charging-Compatible-Keyboard-Ethernet/dp/B089B1G83H/ref=sr_1_14?dchild=1&keywords=3+in+1+Dual+USB+Female+OTG+Adapter+with+Fast+Charging+Data+Sync+Cable+Port&qid=1606411730&sr=8-14
and to convert from USB to MIDI, I used https://www.amazon.co.uk/gp/product/B07KYDP3GK/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
The App I used is Midi File Player
It can take a few connections/re-connections to get all the hardware items to recognise each other, but they will do so eventually.

Hi Don, thank you for the link, it certainly takes me a little further. I’m focussing on finishing the bellows right now, then I will get back on the case with iPhone/iPad/iMac.

Re Roger Belton's Comment.
I apologise for not approving your entry earlier - You must have failed to use the email authentification to get approval
Regarding your query, I have used Palm Pilots for MIDI storage/control but not an Ipad - only recently having got one of my own - so I have no experience of this method.
I searched on the 'net, and found some info', including that on https://www.lifewire.com/use-ipad-for-wireless-midi-controller-1994720 have you seen that?

I am in the process of building a John Smith Topsy 3 with MIDI control.
I am trying to find ways of controlling MIDI via iPhone/iPad.
I have solved hardwired connectivity using an IRIG device, and I’ve also found out about a Yamaha Bluetooth device too, but I have not yet solved which app to use on the iPhone to output MIDI data via the interface.
If anyone has a solution(s) to this conundrum I would be very interested to hear from them.
Thank you.