What is the penalty for overstaying in the UK?

It is a criminal offence if you overstay in the UK and do not have the right to work or study. Indeed, you are at grave risk of being removed. It also means that you are restricted in opening a bank account or trying to find a place to rent and to access medical treatment in the UK.

It is always best to ensure that you do not overstay and apply for a further application before the expiry of your visa or return back to your home country and re-enter with a new visas to the UK. However, if you overstay you are in breach of the UK immigration laws and this is a ground for refusal. You may still be able to submit a new application within 14 days from the date of the grant of your last visa and provide a good reason why your application was not made on time.

Original Source: https://www.quora.com/What-is-the-penalty-for-overstaying-in-the-UK/answer/My-Legal-Services-1