There are 2 train companies operating 2 routes - ECML, Cross Country. The cheapest train costs $90 and is 4h 17min.
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There are 3 ways to travel from Grantham to Chepstow. 1 train, 4 buses and 1 by car are possible between the two areas. The by car from Grantham to Chepstow is the cheapest and fastest. The train operated by running from Grantham to Yate is the most convenient.
It's important to check each mode when booking your ticket so that you can find the best method for you. The cost of each type varies differently, so be sure to use Faretrotter to keep an eye out!