Hi there @Wittonian, welcome to our forum and thanks for your post.
If you did wish to have the broadband and phone line you can certainly have the TV service removed. However, if you have any discounts active on the account these may be lost. This is due to promotional discounts being linked to all services.
It would be best to pop the retentions team a call on 0345 454 1111 or 150 from any Virgin phone and use options 1-4-2. The team can then check to see if it would be cheaper for you or not if this service is removed.
Let us know how you get on with the team, if you need any further help, we will be happy to assist.
Regards
Nathan