In Wales, you have the same terms as in England; you need a 5% deposit or higher, and can borrow a loan of up to 20% of the property value - leaving a mortgage requirement for the 75% balance.
Londoners can borrow up to 40% through an equity loan.
Scottish borrowers still need the minimum 5% deposit but can borrow up to 15% through the equity loan scheme, requiring a higher mortgage LTV of 80%.