It is reasonable to surmise that Dr Docherty (Letters, 4 April) considers Scotland to be an English colony. What a load of tosh! Ever since the Union of the Crowns, many people south of the border have felt the opposite to be the case, with Scottish doctors, scientists, philosophers and politicians coming down unhindered to rule the roost. Conversely, the religious freedoms conferred on Scottish universities by the Treaty of Union helped Joseph Lister to become a Professor at Glasgow where his antiseptic principle revolutionised surgery. He had to return to England to convert the sceptics. I declare an interest as someone who was hired as a medical microbiologist by someone who had been mentored by Alexander Fleming in London. Despite retaining his broad Ayrshire accent, Fleming was never regarded as a colonial helot, but was buried in the crypt of St Paul’s Cathedral, joining Nelson, Wellington and Florence Nightingale. Hugh Pennington, Aberdeen.