Frustrating in the extreme, happens down here too but not so much, I don't think.
Trouble is, stakes are bulk-funded -so, while a club may be more than happy to split races to accomodate horses, that will cost more money than has been allocated and a smaller club won't be able to afford it.
[ please excuse the italics, don't know what the hell I did to achieve those ]
Ok, sorted...ffs ...gremlins..