This is the Royal Doulton OLD COLONY pattern (currently discontinued).

The bone china plate design T.C. 1005

3 pieces are in mint condition, but the cake plate (last pics) does have some minor scratching along the outer edge of plate.

Measurements and condition:

1 serving platter - 13”x10” mint cond

1 handled cake plate - 10.5” very good

2 oval vegetable bowls - 9” mint cond