Seems you saved a few bob as ours cost £150 and it was done by ALDE using the 5 year fluid. What did you do with the old fluid as it is probably illegal to flush down the drain?
I take all my old fluids, paints etc to our household recycling center. Gone are the days when I painted the fences with old engine oil mixed with paraffin. In fact since Covid hit our HRC has had a booking only system with reduced number of bays. An absolute delight, along with easy parking at the regional hospital; one of the few benefits of Covid.