SOLVED. Children's book about a piano player who collects lots of paintings and he moves back to his hometown, finds a kitten and the villain has a chocolate party and sells grenades that are really small

[Francesca]

The ia also a man servant who i think was called wilf and the main character liked beans on toast

[Ayshe]

Snakes' Elbows maybe?

[Francesca]

thats it, thank you 😊