Unfortunately that's not an order that can be enforced.
That order only permits you to recover your costs using the detailed assessment procedure.
Once that procedure has concluded you will have an amount for payment which you can enforce if not paid within the default period of 14 days.
The detailed assessment procedure begins with the preparation of an account of the costs called a 'Bill of Costs (detailed assessment)'. Once this is prepared it has to be signed and served along with various other documents on the paying party.
If the paying party doesn't respond within 21 days you can apply to the court for a default costs certificate for the full amount plus the court fee for the default costs certificate.
If the paying party responds with points of dispute, you can (should) respond with replies to points of dispute. If you can't agree a figure for settlement you can apply to the court for a provisional assessment which is carried out by a judge without a hearing. The court fee varies depending upon the amount of costs you are seeking but the lowest fee is around £335.
Normally the receiving party will be awarded the costs of the assessment process but it depends if any offers have been made. It gets technical rather quickly.
The above is the reason that a lot of solicitors try to agree the amount of costs before the Decree Nisi is issued in order that a specified sum can be put in the order.