They are nothing to worry about. The CAA will give you a 24 hr holter tape. I think you are allowed in the region of 400 extra beats per 24hrs.9do not quote me on that). I have them and have to have a 24 hr holter every six months which my airline pays for.
i would lay off red wine, smoking if you do, tea(more caff than coffee) and coffee. Eating fish helps control your heart. the worst case is that the CAA might insist on ou taking medication for the condition as a precautionary measure. At the end of the day, they want to get you flying as opposed to suspending your medical.