Just noticed these are a lot cheaper on Dive Gear Express:
A replacement drift-pin design K-style 45-Degree Oral and Power Inflator compatible with 1-inch diameter corrugated hoses and the slide-lock fitting on ordinary low pressure BC hoses.
www.divegearexpress.com
Or this one
This quality Compact Power Inflator is reliable because of its drift pin design and compatible with 3/4-inch diameter corrugated hoses along with the slide-lock fitting on standard low-pressure BC hoses.
www.divegearexpress.com
I will need to measure my hose
EDIT: Their UK delivery is absolutely extortionate so I would stick to eBay