This is from the exeter webiste - I suspect your course would have received a high number of applications:
The University operates a ‘gathered field’ procedure whereby applications received between September and January will be considered but a decision may not be conveyed until the middle of May. Where this procedure is operated, candidates will be informed accordingly.
Whilst the majority of our decisions will be gathered field, we may decide to release a small number of offers early for exceptionally well-qualified candidates who fall within the highest tiers, or those with other special circumstances.
Decisions on applications submitted by the January UCAS deadline will normally be made by the middle of May. On occasion it is not however possible for us to make all decisions by this date and it may take a little longer where we have applications (received by the January UCAS equal consideration deadline) where information is required to make a decision, interviews are taking place, or application numbers have increased.