Taking into account all the relevant factors the following Cherry varieties would be suitable pollinators.
AmberGroup CSelf-sterile An excellent old red on yellow cherry from Kent, very high quality, perfectly balanced rich flavour.
Early RiversIn stockGroup ASelf-sterile A large dry sweet cherry with mild acidity. Once widely grown in Kent.
Elton HeartGroup CSelf-sterile A large heart shaped red on yellow cherry.
Governor WoodIn stockGroup CSelf-sterile A large sweet buttery yellow/red cherry.
May DukeGroup CPartially self-fertile A traditional red cooking cherry once widely grown in Kent.
MerchantIn stockGroup CSelf-sterile An excellent giant cherry with a perfectly balanced rich flavour which melts in your mouth
Merton GloryGroup BSelf-sterile One of the best and sweetest quality red on yellow cherries, very big and buttery soft.
Merton MarvelIn stockGroup CSelf-sterile An excellent cherry with wonderful sweet and rich flavour. Texture is juicy and buttery.
Merton PremierIn stockGroup CSelf-sterile A dark cherry, buttery yellow flesh, slightly acidic flavour
Noir de GubenIn stockGroup ASelf-sterile A small very sweet heart shaped black cherry with some resistance to cracking. Meaty/Dry texture with a mild flavour.
Old Black HeartGroup BSelf-sterile A small old-fashioned heart shaped black cherry with elderberry flavour.
RoundelIn stockGroup CSelf-sterile A dark red heart shaped cherry once grown in Kent. Very buttery 'melts in mouth'. Flavour becomes very rich and sweet when fully ripe.
WhiteheartIn stockGroup CSelf-sterile A very sweet yellow cherry with a soft buttery texture. Tastes like a honeydew melon.