Have kitchenaid 5ksm150(UK),recently purchased an

Dear kelpies52 I am having the same problem with a machine purchased from a KA dealer in Spain. Where did find the converter kit? Thank you!

Hello KELPIES52. I see you have two postings, with some minor differences. You say purchased an “ice-cream maker attachment” in the US and my first clarification question to you is, did you purchase the KA Ice Cream Maker, Model KICA0W, or some other brand that said it was compatible with KA mixers?
If you did buy a KA ice cream maker, then it should fit all KA models, including yours. If you purchased another brand of ice cream maker, then it may never be truly compatible, and there’s the rub.
First regardless of what brand of ice cream maker you purchased, you should have both your KA mixer’s Parts List manual and both the KA Ice Cream Mixers Parts List and Users Manuals in hand. If you're lacking them, you can download a PDF version from the KA website at: http://www.kitchenaid.com/flash.cmd?/#/page/home.
Click on Customer Care>Locate Manuals & Guides> and enter the 6 character model number, in your case use 5KSM150, for you mixer and select the file 5KSM150PSEWH4.pdf (777.26 KB) listed under Parts List (1113) (you can actually choose any file sized 777.26 KB; they are all for the different color UK models) and then check to verify this matches your mixer model. This is a good file to have on hand if you ever decide to troubleshoot and fix your mixer by yourself.
After downloading your mixer’s Parts List manual, enter the KA Ice-Cream maker’s 6 character model number, KICA0W (that’s a zero and not an “O”). Download the Part List manual and then the Use & Care Guide (even if you don’t have a KA ice-cream maker) for your future reference.
If, perchance, you have the KA ice cream maker, turn to page 5 for instructions for mounting the drive assembly onto your tilt head mixer. The KA ice cream maker’s drive is designed to fit over the spring and groove pin (stud) on the agitator shaft.
On the other hand, if your ice cream maker is not a KA model, you can still remove the collar, spring and groove pin if you’d like to give it a try. You will need a punch drive with a smaller diameter than the groove pin, a hammer, steady hands and plenty of patience. Tilt your mixer’s head up and rotate the planetary agitator shaft so that the flush end of the pin with the agitator shaft is facing you (the extended part of the pin is facing away from you). Align your punch drive on the end of the groove pin and give it a good whack; repeat until the pin starts to come out the other side of the agitator shaft. Continue tapping until the pin comes completely free. (Note the groves on the pin as you will need to orient the groove pin the same way when you reassemble the spring and collar on the agitator shaft when you’re finished making ice cream). Once the pin is removed the spring and collar will easily come off and then you can attempt to mount the ice cream maker drive on the agitator shaft. Caveat Emptor! Good luck, I hope this helps. Howard, Burke, VA
If this solution has helped you, please rate it, thanks! - hslincoln

Hi J1982,
I contacted www.4kitchenaid.co.uk , who sold me a converter kit. the Tel No is 0844 5572 510. Hope this helps

Kelpies52