However, given the nature of the regulations, particularly in cases where amendments are required urgently this may not always be possible, for example where the risk of forestalling arises.
Fodd bynnag, o ystyried natur y rheoliadau, yn enwedig mewn achosion pan fo angen diwygio ar frys, efallai na fydd bob amser yn bosibl gwneud hyn, er enghraifft pan fo risg o ragflaenu.