Windsor half marathon

Made my half marathon debut today at Windsor. Did a respectable 1:41:16 although bit outside of my target of 1:38 and had really been expecting to get inside 1:40. The course was reasonably hilly in places (although apparantly less hilly that previous years' courses) so my 1:41 probably does equate to sub-1:40 on a flat city centre course. But I had not really done enough training (cycle racing fitness helps not cross-over only goes so far, and averaging 5k once a week is far below even the most basic training schedule), so probably unrealistic to expect much better.

Mile split
1 00:07:45
2 00:07:31
3 00:07:34
4 00:07:53
5 00:07:34
6 00:07:53
7 00:07:41
8 00:07:39
9 00:08:01
10 00:08:05
11 00:08:01
12 00:07:53
13 00:07:04
13.1 00:00:42
Average 7:44 per mile

The slow splits for miles 4 & 6 due to hills, and started to slow up at miles 9-11 (also included couple of hills). Managed to lift it fair bit for the last mile (essentially the whole of the finishing straight) but target time prospects had gone few miles back.
If I get in next years London marathon then think I will get in some proper training.