I've been reading this forum for about a year now, and never felt I could contribute very much,but had to chip in on this one as I'm based near Bury St Edmunds in West Suffolk and have been messing around with water treatment over the past year. I did a Murphy lab test via BrewUK as my starting point and also contacted Anglia Water to get a "second opinion".
A.W. can give you a pretty localised report, though it can appear a tad confusing at first. For example the sulphate figures for my supply varied from 22.9 minimum to 173 maximum. The range was so wide I phoned A.W. and got a very helpful guy, who was clearly pleased to talk to a home brewer and find some-one who was actually using their figures for a practical figure. The explanation was that my supply's sulphur is nearly always going to be around the 22 mark, but very occasionally they have to blend it with water from the fens which accounts for the very high sulphate figure. They are obliged to state a maximum and minimum figure even though 99% of the time it will be the minimum figure.
To answer your specific query Murphy's recommendation for my supply is split into three general groups Bitters+Pale Ales, Stouts, Porters+Milds, and Lagers+Pilseners. For the latter they were recommending using Lactic Acid (20ml per 25L liquor), Calcium Chloride Flake (4.3g per 25L beer)and Calcium Sulphate (2.3g per 25L beer). This seems to work pretty well for me and is not far off what Brunwater (which I've started using recently) suggests. However, for my pilseners I've started using 30-40% reverse osmosis water that I get from an aquarium shop at about 14p per litre and then adding whatever extra Brunwater suggests for that mix. In my opinion my best beers are always my darker ones but my sons seem very keen on the pilseners, so clearly it is possible to manipulate water for lagers even in the very hard water which exists in most of Suffolk.
I had hoped to pick the brains of the guys at Greene King when I did their brewery tour, but they put all their water through reverse osmosis as they are brewing so many different "regional beers" Old Speckled Hen (Oxfordshire), Ruddles (Rutland) and I think even Belhaven (Edinburgh) is sometimes brewed in Bury too.
David