Andrew gained an Honours Degree in English in 1974 and then joined Bonhams in May 1975. Having sat his professional exams for the Incorporated Society of Valuers and Auctioneers in 1977 and gaining his letters in 1979, he went on to become the manager of the Valuations Department from 1980 to 1982.
In November 1982 Andrew set up as an independent valuer in Witley, Surrey, moving in 1988 to Godalming and then to London in 1996.
As the client base expanded his firm grew to incorporate a small team of staff and co-valuers. The firm is now based in Kent where it continues to flourish.