i wouldnt worry in the slightest!
mines never been serviced by a renault dealer - when under warranty was done by local specialist (just the minimum) and now i do the work which is far and above what renault recommend!!
been a few on here that people have thought about buying with "full service" history...and when you have a close look they havent been done as per the 12k/12m (197) - some traders think as long as each section is stamped eventually thats "full service history" - so using a specialist wont be a worry given those standards