The UK version of Quicken has been discontinued, yes. Quickbooks is made by the same company but is more expensive, I believe. I use the US version, which can be used for business expenditure and income accounts. Because it's a US version, it's tricky (but possible) to account properly for VAT, so you'd need to know what you're doing from a bookkeeping perspective.
You can download a trial version of quickbooks from intuit.co.uk.
Another free option is [broken link removed].