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Forsythias are spring flowering and have regular shaped flowers, they are in the Oleaceae family and predominantly various shades of yellow.
Brooms (Cytisus) are in the Fabaceae (Leguminosae) family and have irregular shaped flowers.They tend to flower considerably later than Forsythia, common broom Cytisus scoparius flowers in May.Also there are many garden forms with flower colours varying from white to red.
David J Trevan
Lat/Lng: 51.3468, -2.9406
OS grid ref: ST345612
located in small park in the middle of an estate.