Had a stop / start prang on the M25 (london orbital motorway) this evening, probably only 5mph (foot missed the brake

ops:

)
ran into the back of a toyota rav4 - hit his spare wheel (as it hangs on the back door) - but have dented and bent the bonnet :-(
Everything seems ok, got home from m25 (15 miles of hot weather que’s), no cooling system drips, no funny noises and instrument readings all fine, and the air con also still working.
BUT, due to drive to Goodwood tomorrow morning – what do think?
Should I leave the old girl at home?
pretty annoyed with myself, had just started to get on top of things that needed doing :-(
photos attached - opinions gratefully received.