Personally, bras that I have been measured for never fit right and are never comfortable. I don't bother getting measured anymore.
Go to a large M&S, grab a load in the 32E and try them all on, on the loosest hook setting. If none of them fit properly then that's not your size! The reason you use the loosest hook is because the bra stretches over time, so to maintain the correct fitting you just move up to the next hook when it starts feeling loose.
Determine where it's not fitting right. If they're too tight around the chest, then try a 34. If the cups are too big, try a D or DD. Just keep trying a one size up or down until you're happy with the fit and look of it.
The band should sit flat on your chest between the boobs, and should not ride up at all at the back. If a bra gives you "fat armpits" its too tight. Cups should be filled perfectly, no gaping or excess material, or so tight it creates "4 boobs".
Not all bras are created equally. Different brands all fit differently, and even in one brand, sizing seems to vary between styles. I ordered 4 different styles from M&S earlier this month (all same size) and only 1 fit properly.