Formal:
* Bienvenue à Ilford. (This is the most direct and literal translation.)
Informal:
* Bienvenue à Ilford ! (Adding an exclamation mark makes it more friendly and welcoming.)
* Ravi de vous accueillir à Ilford. (This means "Happy to welcome you to Ilford.")
More specific:
* Bienvenue à Ilford, en Angleterre. (This emphasizes that Ilford is in England.)
* Bienvenue à Ilford, dans le comté d'Essex. (This specifies the county where Ilford is located.)
You can choose the phrase that best suits the situation and your relationship with the person you're welcoming.