Colin Lawson makes a welcome return to the Festival with two distinguished colleagues for a fascinating programme of music from around 1800 played on instruments of the period.  Beethoven’s youthful Trio in B flat, Op. 11, is contrasted with a trio for the same instruments by his talented pupil and patron, Rudolf, Archduke of Austria.  The programme also includes Beethoven’s early Sonata in F, Op. 5 No. 1, for cello and piano, and Weber’s Grand duo concertant, the greatest work for clarinet and piano from the early nineteenth century.  Colin Lawson is Britain’s leading exponent of early clarinets, and the author of a number of books on the subject. Sebastian Comberti is one of the foremost cellists specialising in period performance.  Steven Devine, one of the most sought-after of historically informed keyboard players, plays a fine modern copy by Christopher Barlow of a Graf fortepiano.