Yup I ordered a pair of nuts and dustcaps this morning.
Previous owner receipts gave no indication of brake linings being changed in the recent past. I read about the brake lining problem so resolved to take a look, only to be stymied by the lack of a suitable socket on a Sunday afternoon.
Whilst it's 25 years since I've fannied about with cars with any seriousness...I feel it's incumbent on me to understand how this 106 works. I'm strangely enthusiastic about putting the old ramps and axle stands to good use.