Can the buyer refuse to hand over the goods upon collection?

Yes, a buyer can refuse to hand over the goods upon collection under certain circumstances, such as if the goods are defective, not as described, or if the seller has not fulfilled their contractual obligations. However, the buyer should be aware of their legal rights and obligations in such situations. It's advisable for both parties to communicate openly to resolve any disputes amicably. If necessary, legal action may be pursued to enforce the contract.