A final update, and quick summary. I ordered several items from Nippy on Sat 30th July, they were despatched on the Mon 1st August and I received them on Wed 3rd August. I checked the package and all seemed right - 2 Wunderlich levers and some other bits and bobs. At the weekend, I discovered on fitting that one of the levers was incorrect. These things happen. On Mon 8th August I discovered that Nippy has no phone number and the only way to contact him is by web form/email. So a conversation that should have taken 2 minutes took a day, but in any case I knew the part was wrong so sent it back on Monday to arrive Tuesday. One Wednesday 10th August I received another lever, again the wrong one (this time clutch instead of brake) and we have another email conversation (I ask him to call me so we can resolve it quickly but he persists with email) where Nippy asks me what part number I need - I don't know because all the part number are not on his website. We finish this conversation on Thursday morning,the part I want is now not available. Nippy agrees to refund the item and postage, so I make another trip to the post office (4 miles away) and email him postage receipts. It's now Friday, and I have no refund and no lever, although I'm sure Nippy will refund promptly. This took a week to resolve, and that was only because I happen to be working at home this week, and so I can pick and respond to email, and get to the post office to post the returns the same day I receive the wrong item.
I phoned SportTouring, who answered the phone immediately and checked the correct part number with Wunderlich. They didn't have it in stock but will order it. They seemed very pleasant and efficient, and I can talk to them. They will get my business in future.
There are millions of retail transactions every day where we pay for stuff which the retailer provides us - these don't require comment. Sometimes there's an error. Of course this happens from time to time, and it's the way that this mistake is dealt with that delivers either a good or a bad experience. For me, this was a bad experience because what should have taken 5 minutes to sort out on the phone took a week - if on Monday we had determined that Nippy did not have the correct item, then fair enough - he refunds me and I have time to find it elsewhere.
Nippy, don't be so tight, your business must be big enough now to hire someone to answer a phone.