Well, I feel silly now.
Yesterday, on the assumption that the Cambridge bus system would be painful doom in one form or another, I took a taxi to work, costing me eleven quid.
In the evening, since I was going into the town centre for pizza, I felt safe taking the bus, because, well, practically all buses go through the town centre. Imagine my ‘D'oh!’ when I find that the C1 bus, which goes between the town centre and the nearest stop to ARM, happens to also be the bus which goes between the town centre and the nearest stop to my own front door. So this morning I got on the bus at home, got off it at work, and paid about a fifth of what I did yesterday. I feel very silly.
Still, I should get the car back today, so that'll make life easier. (The bus may have been a lot more convenient than I'd feared, but it still doubled my normal travel time.)
Also I got a failed-parcel-delivery note yesterday. I can't think of anything I'm currently expecting apart from the Dension MP3-based car stereo I've been waiting for for a month and a half, so with any luck it'll be that at last! Which would be nice, since I was just on the point of ringing up again and demanding a revised estimate of when it might turn up. I hope to pick it up tomorrow (bah, delivery companies) and find out for sure…