Xpathonurl help please

Im now using xpathon url to fill a cell with a specific value off a racing market. However it doesnt always give me the value Im looking for.

An example URL is

http: //www.betfair.com/www/sports/exchange/readonly/v1/bymarket?currencyCode=GBP&locale=en_GB&marketIds=1.124761472&rollupLimit=2&rollupModel=STAKE&types=MARKET_STATE,MARKET_DESCRIPTION,EVENT,RUNNER_DESCRIPTION,RUNNER_EXCHANGE_PRICES_BEST,RUNNER_METADATA

I am using

XPathOnUrl(URL,"//runnernode[1]//price[1]")

to give me the first back price for a specific horse. It returns a value fine but its not always the first availabletoback price for that horse. There are 3 and the value returned isnt always the first.

Please could someone tell me what I need to put in to force it to give me only the first availabletoback price.

The above URL is available till thursday, Ill update it to another URL after that.

Once again many thanks, Ive been trying for several days but have now given up to save my sanity.

Can you supply a new URL? I'll look into a correct Xpath request.