In
the
early
1970s
the
DVLA
began
to
computerise
records
of
vehicles
previously
maintained
by
local
vehicle
taxation
offices.
This
process
involved
the
registration
of
new
vehicles
and
the
conversion
of
records
already
in
circulation.
The
computer
record
for
old
vehicles
was
closed
in
1983
and
vehicles
which
were
undergoing
restoration
at
that
time
were
issued
with
letters
from
the
DVLA.
In
1990
rules
were
introduced
which
allowed
vehicles
to
claim
back
their
original
mark,
on
a
non-transferable
basis.
This
means
that
you
will
not
be
able
to
transfer
it
or
put
it
onto
retention
at
a
later
date.