Has anyone worked out a way of fitting mudguards and rear lights to the Carry Freedom Y frame. I thought I'd ask before I start bodging.

Not mudgards. Put some hinged sidewalls on mine that works as mudgards. Maybe a raincower w bungees to cower the load in stead, easy to rinse off after use?

Lights yes. Put two small L shaped brackets under it in the rear and put the regular rear light I put on all of my bikes. Got crushed after a short time, so now I remowed it and use the "clip on" type. Guess reflectors is enough if you`we got rear lights on your bike.

It all depends on how you store and use the trailer.