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.
Bigarreau de SchreckenGroup BSelf-sterile A high quality large sweet black cherry with a rich and slightly acidic flavour. Meaty texture with an initial bite to it.
Elton HeartGroup CSelf-sterile A large heart shaped red on yellow cherry.
Governor WoodIn stockGroup CSelf-sterile A large sweet buttery yellow/red cherry.
Kentish RedIn stockGroup DSelf-sterile A small red cherry once grown in many parts of Kent.
LapinsIn stockGroup DSelf-fertile Also known as Cherokee, this is very popular heavy cropping self-fertile sweet cherry. A late cherry with with dry/meaty texture and mild sweet flavour.
May DukeGroup CPartially self-fertile A traditional red cooking cherry once widely grown in Kent.
Merton BigarreauIn stockGroup CSelf-sterile A delicious sweet dark red sweet cherry with white flesh. Very unusual.
MerchantIn stockGroup CSelf-sterile An excellent giant cherry with a perfectly balanced rich flavour which melts in your mouth
Merton CraneGroup DSelf-sterile A high quality black sweet cherry.
Merton FavouriteGroup BSelf-sterile A lovely and handsome buttery textured sweet cherry with a mild rich flavour and with an initial bite due to it's thick skin.
Merton GloryIn stockGroup BSelf-sterile One of the best and sweetest quality red on yellow cherries, very big and buttery soft.
MermatIn stockGroup BSelf-sterile An Excellent large black cherry, sweet buttery/soft texture balanced perfectly with a subtle acidic aftertaste.
Merton RewardGroup DSelf-sterile A dry cherry with a distinct bitter cherry flavour.
PennyIn stockGroup DSelf-sterile A modern cherry raised at East Malling in Kent. Big, meaty and dry. Can develop a rich/acidic flavour when fully ripe.
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.
StellaIn stockGroup DSelf-fertile The most popular sweet cherry in the UK. Self-fertile and reliable cropper.
Summer SunGroup DPartially self-fertile An excellent sweet cherry with good frost tolerance particularly suitable for colder locations.
SunburstIn stockGroup DSelf-fertile A heavy cropping self fertile cherry producing large sweet almost dark red cherries. The flesh is meaty and slightly juicy and has a light rich/sweet flavour
VanGroup CSelf-sterile A round dark red cherry with firm sweet flesh.
VegaIn stockGroup DSelf-sterile A high quality modern large red on yellow sweet cherry.
WaterlooIn stockGroup BSelf-sterile An Old black cherry, slightly juicy, meaty and sweet. Not as rich as the best.
WhiteheartIn stockGroup CSelf-sterile A very sweet yellow cherry with a soft buttery texture. Tastes like a honeydew melon.