I am answering my own question just in case it helps anyone else with the same problem.
After researching further on the internet (but not on Indesits website as it was rubbish) I found the solution.
F-05 means that the out flow pipe is blocked. To solve the problem you can remove the small cover at the front of the washing machine (at the bottom). Unscrew the cap that is found there - be persistent as it tock me some time. When it finally came out - out popped two well washed 1p pieces. I poked around but couldn't find anything else. I tightly screwed the cap back on and the machine worked perfectly.
Hope this might help anyone else with a similar problem.
H182
August 2008