@Stuart ********
the stv is 90 days extendable for another 90 + 90 . So 9 months in total.
You need £5000 or what ever the equivalent is in your own bank.
Book and pay for 3 months accommodation. Just book stuff and cancel it after the visa is issued. Agoda or booking . Pay on credit card and you don't have to spend real money.
Insurance for 3 month .
Many say it's complicated but it's not .
9 months you know you can have.