Forget my suggestion. The Stoke route seems the way to do it. Where does the London Midland call on its route?
Stone (Staffs) Stafford Rugeley Trent Valley Lichfield Trent Valley Tamworth Atherstone (Warks) Nuneaton Rugby Long Buckby Northampton Milton Keynes Central Leighton Buzzard Watford Junction London Euston
Which is why I am always reluctant to answer when a request is made for the cheapest option or the cheapest combination of tickets. I am happy to point people in the right direction if they want tips, but the risk with going for the absolute cheapest, is that it isn't actually good value. But, of course, value is subjective!This journey would,of course,be much slower and only 40p cheaper.