Your local GC?

Not sure you'll find Osmocote Topdress or Osmocote bloom anywhere - its used by nurserymen and other professionals in the horticultural trade, not sure its sold in smaller packs for amateur use. Its too late to use Osmocote Bloom anyway - its intended use is for summer bedding plants in small pots earlier in the year, usually when they're still under cover before they're ready for sale.

Thanks for replying. Yes I did a bit of research on it and would love to get some for next year. It would be perfect for me. Just don't know how to source it

Well unless you know a professional plant grower, there's probably no way to get any. They're formulated for a specific purpose in the nursery trade, so they're not really appropriate for general home use anyway. Osmocote make a range of other good fertiliser products suitable for use by amateurs though.

Thank you Bamboo, I'll have a look around