Consumer satisfaction with the Big Four banks increased to 80.1 per cent in April, an increase of 0.2 percentage points from March "and well above the long-term average of 74.9 per cent recorded since 2005," Roy Morgan Research said yesterday.  Satisfaction among home-loan customers of the Big Four at 78.0 per cent "continues to be below that of their other customers (which is 80.5 per cent) "but over the last year they have closed this gap a little."   Norman Morris, Industry Communications Director at Roy Morgan said yesterday that, on their main financial institution satisfaction score, "NAB has taken a very narrow lead with 83.0 per cent, compared to the CBA with 82.9 per cent. These two are followed by the ANZ (81.5 per cent) and Westpac (80.3 per cent)." Morris said that Roy Morgan data "shows that customer satisfaction with the Big Four banks remains well above their long term average and after trending up strongly for more than a decade, for the last two years it has plateaued rather than showing any real signs of declining."