Regarding overhead wire warning flashes, a study of 'Rail Portfolios no. 6, The Cromptons', shows it is highly likely these weren't fitted to 33s until May 1981, when they started on the Crewe-Cardiff route. This is surprising, as they definitely worked over OHLE routes, e.g. to Ripple Lane, the LTS route being electrified as early as 1961. Perhaps this is indicative of the Southern's somewhat cavalier attitude to H&S, as there were still examples of 33s without yellow warning panels as late as October 1966!