Limited and LTD are interchangable and it is simply an aesthetic decision as to which one you would prefer to use.
You can change the suffix from 'Limited' to 'Ltd' (free of charge) just after you purchase a company formation package and before you submit your application. You can change this by clicking "change company name" from above the current section of the application you are working on (Please see process below).
Process to Change Company Name during Application Stages:
- Click change company name
- Type your company name, adding Limited at the end and click Search
- Click Continue. You will see 'Limited' has now been added