Japanese quince Lemon and Lime 

Chaenomeles Lemon and Lime is a medium sized deciduous, shrub with spiny spreading, branches of glossy dark green leaves. Clusters of pale yellow green flowers open in spring fading to white. Flowers are followed by edible green fruits ripening to yellow. Ideal for training onto walls or can be planted as a specimen shrub. Will also make a good flowering hedge. Hardy. 

Eventual height and spread up to 1.5 metres