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.
Elton HeartGroup CSelf-sterile A large heart shaped red on yellow cherry.
Emperor FrancisIn stockGroup DSelf-sterile Exceptional cherry. A dark red sweet cherry with a pleasingly soft buttery texture which tastes like fine tawny port.
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.
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
Merton RewardGroup DSelf-sterile A dry cherry with a distinct bitter cherry flavour.
NapoleonGroup DSelf-sterile A popular traditional white cherry once widely grown in Kent and known as 'Kent Nap'. Very crunchy and meaty/dry with mild richness and acidity.
Old Black HeartGroup BSelf-sterile A small old-fashioned heart shaped black cherry with elderberry 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
VegaIn stockGroup DSelf-sterile A high quality modern large red on yellow sweet cherry.
WhiteheartIn stockGroup CSelf-sterile A very sweet yellow cherry with a soft buttery texture. Tastes like a honeydew melon.