Twelve weeks is a very long time for a 2 page particulars of claim to be drafted.
There are several points to consider.
1. The barrister may have been waiting for other information before it could be completed, as the Particulars needs to have details of loss of earnings as at the date of the claim , predicted future loss, a medical report needs to be attached and a prognosis.
2. The barrister is employed here by the solicitor and so your grievance is with your solicitor, why did the solicitor not, chase, insist or select another barrister.
3. You are unlikely to suffer financial loss, any monies lost during those 12 weeks can be included in the claim.
I appreciate the stress you have suffered, the personal injuries damages will include an element for the stress of the litigation.The delay will not ultimately adversely affect your claim.
The way I would deal with this is in 2 stages. The first is that I would write asking for an explanation from the solicitor within , say, 14 days. If I am not satisfied with the explanation I would say so and why and advise that I would expect any solicitor's charges to be adjusted to reflect the position.
If there are any further points kindly reply I will be happy to respond.
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