### Instruction:
Which league are West Ham in and where is there ground?

### Input:
West Ham United Football Club is an English professional football club that plays its home matches in Stratford, East London. The club competes in the Premier League, the top tier of English football. The club plays at the London Stadium, having moved from their former home, the Boleyn Ground, in 2016.

### Response:
West Ham United are in the English Premier League which is the top tier in England. They play at the London Stadium in Stratford. Stratford is in East London. Up until 2016 West Ham played at the Boleyn Ground.