As avid cruisers, we embark tomorrow with more that a tad of trepidation, upon a different type of cruise holiday, as we explore the Oxford, Coventry, & Ashby canals. Our home for the following week will be 'Beatrice' a 53 feet narrow boat, specially adapted for disabled passengers. The holiday has been organised by our 45 year old son, who at the age of 18 years, suffered a near fatal head i…