Viral - a form A restriction is also known as a joint proprietor restriction and owners often apply to register it when they sever their joint tenancy/become tenants in common
As you used the term TIC I assumed that's what you were referring to -apologies
Joint property ownership: Overview - GOV.UK (www.gov.uk)
If you haven't checked the register then you can do so online for £3
Search for land and property information - GOV.UK (www.gov.uk)