Arh, thats good news to hear that you're back to normal again. Yeah, the boiler was meant to be serviced just after Christmas but the HA never booked it in and automatic program on the programmer, after so many weeks etc, automatically drops into limp mode with an error message if the boiler isn't serviced and the counter reset. It did crap itself 4 weeks ago and they came and put a bypass code in and today they are doing the service.