As the others have said. GP not A&E unless you get short of breath/faint/chest/pain
One odd question - anyone die suddenly of an unknown condition in your family before the age of 40, or any family history of "Cardiomyopathy"? If not, don't worry too much. If so, tell the GP.
Standard work up for me for this as a GP these days would be 12 lead ECG and bloods including thyroid function (for over-activity), if ok try caffeine reduction, if anything abnormal or things get worse get echocardiogram and 7 day ECG event monitor (which we can fit at the surgery). 19/20 times we don't need to do this. Most of the people who need referral to an EP Cardiologist have longer sustained arrhythmias. And I've had these (probable) PVCs myself.
One message I would like more people to know, is if you have a sustained completely irregular heart beat (the drummer of the band is completely smashed, not playing jazz or a tango...) for more than an hour, and you know it was normal before it started, there is a window of 24-28 hours before we need to get into warfarin etc... so seek help stat. Same applies to if you have a regular but fast heart rate at rest of 145-155 bpm - in which case you probably have Atrial Flutter with a 2:1 block and need to be seen quickly. to get you out of it without warfarin etc...