Have a word with Cranfield and the operator of the Jetstream.
By all means file a Chirp report, but one thing I have to ask is whether you thought of moving out of the way yourself - there is no point standing on the Rules of the Air if the other guy isn't going to follow them.
They may be flying IFR and are not looking out of the window, so the 'see and avoid' doesn't apply to them.
If you always assume that the other guy hasn't seen you (or is an idiot) and take early avoiding action, even though you may have right-of- way, you are likely to enjoy a long flying career.