Weather Outlook for early May

I've checked some long term weather sites again and forecasts for the UK in early May predict totally different things...
NetWeather says:
May "With low pressure currently expected to have more of an influence during May, current expectations are for a wetter than average month, with the potential for some very wet weather. Temperatures are expected to be close to average across much of the UK"
Weather Outlook says:
May: Temperature: Close to or slightly above average. Precipitation: Slightly below average
"The first half of the month is expected to bring a good deal of dry and fine weather, with temperatures climbing to above average values. Less settled conditions are likely at times, especially in the west, where showers or longer spells of rain are more likely."
There's a good chart here which looks hopeful http://www.theweatheroutlook.com/twoforecasts/17%20to%2030%2 0day%20outlook.aspx
Metcheck says:
23 Apr - 16 May "Again, a cool period usually, however the Atlantic starts to quieten down and winds from the North or East are very common whilst Westerlies are rare."
BBC Weather says:
Monday 3 May 2010 to Sunday 16 May 2010
"For the first 2 weeks of May, values of temperature, rainfall and sunshine are expected to be close to the seasonal normal. The best of the warmer and sunnier days are likely in the southeast, with northwestern areas more likely to see occasional wetter, cooler and cloudier spells."

So I'm packing waterproofs, t-shirts, sun cream and jumpers.