I've done the Lakeside Canal race twice near Frimley, that's "only" 8 miles but is a good race and I've signed up to do it a third time. The Brooklands half is very expensive and has an early start time on the day the clocks go forward, so hasn't tempted me to enter.
Have you considered the new Surrey half marathon between Guildford and Woking on 9th March? I'd also recommend the Fleet half which is my local race and is very well organised. You could also look at the Wokingham, Reading and Bracknell half marathons.
As a pedestrian, I've had many cyclists going through red lights get way too close to me as I cross the road.
I do understand why they find it tempting, having tried the Boris bikes when they first arrived, I found cycling less than two miles meant dealing with twelve sets of traffic lights. Very irritating indeed.
The thing about RFL (and I've marshalled several) is that of the thousands of ladies who turn out less than 100 actually run the whole way, and maybe another 100 will run a little bit, and a time of less than 30 minutes will get you comfortabely in the top 50. I've seen a 13 year old girl finish first by quite a margin, and one year I watched a lady walking briskly round the course carrying 4 carrier bags of shopping as she was on her way home from her weekly shop at Tescos. She finished way ahead of the vast majority of the field. The fact is that Race For Life simply isn't a race, it's a 5k sponsored walk. It does a great job in raising money, although apparently a large percentage of the 'competitors' never actually send in any sponsorship money. What grates for me a little however is the fact that the people are praised like they've achieved something spectacular when most have simply ambled round 3 miles. I know that's more than many of them will usually do, but even so, it isn't really that great an achievement. When I was a kid sponsored walks were 15 or 20 miles!
Bit harsh. If you haven't done any sport since you were at school, running 5k is a huge achievement. Lots of the women DO run, but they may take a walking break. It was a Race for Life that got me into running 3.5 years ago and yes I did run/walk it. But 3 months later I ran a 10k in well under an hour without stopping to walk once. And when I was at school I never walked more than 9 miles for a sponsored walk.
As for "not sending in sponsorship money" this is something that really REALLY annoys me about RFL. They say this and it's so misleading. There is a simple reason - people use justgiving pages and the like! And of course there are a few people who either don't run or don't collect sponsorship - I'm not sure I did actually, I think I probably just gave a donation of £20 or something. I really don't think people raise money and then pocket it themselves.
The nicest 10k medal I've had was for the Totnes 10k in Devon. Otherwise the ones for the Dorney Dash and the Yateley 10k series are pretty decent and you can collect 3 of the Yateley ones. This year they had a bottle opener in them.
If you are based in Devon (going by the Plymouth 10k) the Totnes 10k is very good - it's usually the first Sunday in August and is a mix of trail/field/woodland/path. Great medal but not an easy PB course - one enormous hill and a few smaller ones. Also the Exeter 10k and Torbay Regatta 10ks in August.
In my local area we have the Yateley 10k series which take place on the first Wednesday evening of June/July/August which always receive glowing reviews and the Fleet 10k which is usually around the end of October. Other choices in the Hampshire/Berkshire border area are Shinfield (fast PB course) and Swallowfield and Mortimer in September.
Oh and if you want something a little different - the Guernsey Easter Running Festival has four events including a 10k and you can do all or any of the events.