While some guaranteed bank accounts may allow an arranged overdraft (so you will be able to go slightly into the red if you warn your bank first), they will not offer an unarranged overdraft, making it much harder, if not impossible, for you to accumulate unaffordable debt with this kind of account.
Other common restrictions on these accounts include the absence of a cheque book and a tendency to be based solely online. While most will come with a debit card of some sort, there might be more restrictions on withdrawals (and remember that you will almost always be charged for using your card abroad). It's important to consider your options carefully, especially as some guaranteed bank accounts may not even allow direct debits and standing orders.
Because they are designed for people who are somewhat limited in their choice of bank account, these accounts may not be as enticing as others. Although some of the best guaranteed bank accounts may offer cashback and other benefits, most will likely charge monthly fees.
To open a bank account with no credit check, you will still need to fill in some personal details and prove that you live at a valid UK address. You will also usually need to be at least 18 years old.