OK, need to ask... whats BVIP stand for? Perhaps British version IPA?
There are variables such as how much Hot Liquor is used in the mash... pH also is another piece of the puzzle... See, thats were note taking and re-doing a grain bill will help you find that answer.. Water is a vast and technical variable.. When you first start reading, you'll be overwhelmed, unless you know chemistry.. I see Mabrungard has been on here as of late.. He's the guru of water, as I know it.. First place to start is a water report, then, a bunch of reading... I'm a carpenter, and I've grasped a very small bit, and I can manipulate my pH and have even better tasting brews... its taken time.. Sneezles61