There are restrictions if there is a relevant transaction CA28200:
In such circumstances:
The limit is the seller's disposal value if any
CA28550.
If the seller does not have to bring a disposal value to
account the buyer's allowances are restricted to the lowest of:
There are different rules about the buyer's qualifying
expenditure where there is a sale and finance leaseback
CA28500.
These restrictions do not apply if the asset is new, the
seller's business includes manufacturing or supplying assets of
that class and the asset is sold as part of the seller's normal
business. For example, a man who runs an electrical store may sell
his sister a new computer from his stock. If his sister claims PMAs
on the computer the restrictions on allowances do not apply. She
can claim PMAs on the price she pays.