I've just returned from them and they admitted to it quite quickly. Apparently one of their mechanics did it, bodged it and didn't tell the boss. They apologised profusely and agreed to make good so that's me placated. My ZZR will be going elsewhere for MOT though, either VP in old Sarum who seems highly recommended or MOT supercentre that Jed mentions above (they have a Tidworth branch but it doesn't do bikes).