My prediction (or secret hope) is that 205 will be the last in service - I worked at a bus garage once where we were similarly running down a fleet, and the grottiest example externally proved to be the most reliable and lasted right to the end. In fact generally speaking, the stock with the oldest/worst exteriors were usually the most reliable - were never stopped long enough to get repainted. Conversely, those with the best paint jobs were usually the least reliable.
314205 is currently my favourite unit.
Certainly seems something of a unit shortage just now - virtually nothing lined up outside Shields Road this morning.