Extrablatt- I've got some Avios points but haven't tried using them as part payment yet, thanks for the tip. I had run a quote through for paying for one return flight using the points however the flight availability was rubbish; limited compared to cash payment, not suitable, so quite unfair I thought. I wasn't sure if I want to save my Avios for buying an entire flight one day and hadn't tried using them as part payment, second reason was didn't know could use the as part payment because the initial BA UK quote screen didn't say you could I think. Then when I fiddled with it, it came up with what you mentioned.
I don't have any experience of using Avios, what do you think about best way to get the most out of them?
Jimmybell - must fly out of Heathrow, yes although cheaper especially with Ryanair or Easyjet or Norweigan Air (I heard) not any of other London airports because if the extra time and hassle for getting to the other airports from my place. Not great for a short trip. In addition because of the destination airport too.