Coast2Coast are now offering BMW motorrad, in addition to cars. Savings on BMW cars are usually good (though can be slightly bettered by playing off their quotes with a dealer directly). However, the savings on BMW bikes are rank - even seem to have inflated the list the list price? Still, might be worth checking back at some point.
https://www.coast2coastcars.co.uk/new-motorcycles/
https://www.coast2coastcars.co.uk/new-motorcycles/