I agree with chuck, I would call friends and family and may arrange breakdown cover in future just in case (cover can start from as little as £40 pounds a year) so its not out of reach for most budgets
to answer dustypuss, it depends what the breakdown is, if the car just stops going it is probably petrol. cars don't normally just stop going, unless your big end goes, and then it would usually get you somewhere near civilisation.
Cars break down for hundreds of reasons, big ends probably being one of the least common (also big ends going is not really something that would sneak up on you, the car would be making a hell of a racket before they went)
if you are on 02 or orange you can have lend us a quid or the orange euivalent. plus, most people have free texts don't they? You can have a phone top up using a debit card without needing the card with you.
you seem to be online oange and o2 also do free texts via their website just log into your account not sure about other mobile companies but you can always try