Recently I got one of these to try and deal with the problems of (re)threading holes that are so close to something you can't get a full turn on a normal tap wrench so are faced with the tedium of removing and part-truning and replacing it several timers per turn:
However, not actually used it in anger yet.
Draper 45680 594 Expert Schroder Ratchet T Type Tap Wrench 2-5mm
Expert Quality, manufactured by Schroder in Germany for Draper Tools. . Ratchet action with forward/reverse operation and lock. . Two hardened jaws and polished plated finish. . Knurled screw on Stock Nos. 45680 and 45698; 20mm hexagon on Stock No.19640. . Display packed.
www.lawson-his.co.uk
However, not actually used it in anger yet.