Yes you need a rated Sold Secure lock dependent on your bicycle value:
- Insured bike value under £500 require a Sold Secure Bronze rated lock
- Insured bike value under £1000 require a Sold secure Silver rated lock
- Insured bike value over £1000 require a Sold secure Gold or Diamond rated lock
- Insured bike value over £1500 require a Sold Secure Gold or Diamond rated lock