It is prudent to get legal advice as soon as possible as the set time period you have to reply to a claim starts to run upon being served with the formal court claim.
Getting advice early will allow you to give clear instructions to your legal representatives along with any supporting evidence which may be pertinent in the matter.
Once your legal representative has instructions they can advise you on your legal position, the options available to you and the prospects of success for those options.
This allows you to make a fully informed decision, in good time to allow your lawyer to present your case in the best way possible.