Steve
Mini shocks work just fine on the Mk1 Family Three, if you want to do them again heres the info but I would be inclined to leave well alone
The original Family three front shock absorbers did not work they lock up after only a short mileage it is  recommended that they are replaced with the following components-----
 The front shock absorbers,  part number  QAH127093 S-ABS Mini. Can obtained from motor factors Davmac Spares Ltd of Nottingham  (Tel 0115970 3222)  They do two shocks under the same part number one is imperial and the other metric. It is important that you get the 1.5 inch dia imperial ones the metric are too wide and will not fit.
The rods will have to be modified to suit the Frisky. The rod will be too long and will need shortening to match the old shocks and the thread extended by the same amount up the rod.
The front springs to go with these shock absorbers are  Ref No G6119 Frisky Spring (D124/11)and  are made  at Springcoil Ltd  Sheffield Tel. 0114 273 1111 
The original units were Armstrong  AT6/7 S.6187 Type C (with minor mods)
Note -- do not force open the alloy cups as they will crack likewise do not over tighten then or they will crack.
Ok thats your Sunday afternoon sorted
John
www.meadowsfrisky.co.uk