My car was registered on something like the 10th February and I've moved my service date out to the right by a Month every year since then; because I ain't going out in the crap weather fo sho!
Only the first 3 years are covered by the 'proper' warranty, the rest come under 'Toyota Relax' and are Service Activated. Toyota's website states "After the first 3 years expire, you receive an extra 12 months (or 10,000 miles) of warranty coverage every time you complete a qualifying full or interim service at an authorized
Toyota UK Centre."
Next year my 4th Annual Service will take place at the beginning of April, and just like the one I had done in March last year, will be entered into my electronic record with confirmation of my 12M warranty following sometime after. Not had any indication that the difference between dates would be a problem, especially at £600 a pop! So
@Triggaaar, I'd say that the dealership is talking from a different orifice than would be normal for us humans...