Hey BIELoney - greetings
Went on Boots.com and searched for ALLAY, as you probably did - not there.
Confirmed the search engine is working at Boots.com, entered ActiPatch and got 3 SKU hits - back, muscle & joint, and knee, so the engine is working.
I also have no idea why ALLAY is not available through Boots, company would know. Hope this helps