I would second a suggestion of the West coast of Scotland. You need to plan your fuel stops carefully. Kirkbride is a good option just before crossing the border. Prestwick is worth considering for fuel. Friendly, quiet, and reasonable for an airport of its size (book through Prestwick Flight Centre). If you don't want to go quite as far as BB suggested, I would recommend Castle Kennedy. It is a short walk up to the castle and gardens. Alas Gigha is sub-600kg these days, but Islay is worth considering. If you are feeling adventurous, Barra is an one-off. Definitely a special logbook entry.