So after going to the doctors on Tuesday I went to see a proper sports physio this evening.
I've definately got plantar fasciitis. Looks like it will take at least 4 weeks to heal.
What a drag and just when I'd got myself to a decent level of fitness!
She seemed to think it was because I mainly run on trails and doing a 10k road race on tarmac caused it.
Still it feels a bit better after a sports massage and my foot is currently all strapped up!
So it looks like I will have to take up swimming for the time being!