It is a rule not to review previews of performances and most recently this has hit the headlines more with naughty media antics of Benedict Cumberbatch's opening night of Hamlet. This weekend I was present to see two previews of Made In Northampton's latest offering, Gaslight. I don't get to see the finished product for a fortnight and by then it will be near the end of its run, so it leaves me in a tricky situation, to review now or wait until its almost over. It is however a simple answer, review now, because although they were were previews, they were both performances of an excellent quality in any case (with just a hint of differences at work between shows) that I have no particular need to criticize. Gaslight is a 1938 play written by Patrick Hamilton and tells the tale of an evening in the life of Jack and Bella Manningham at home in 1880. Telling a tale of part psychological thriller, part mystery and more importantly what amounts to domestic violence, it is a cle...