Do not waste your time (and I suppose also that of the people at LHR/MAN or wherever) by putting all that stuff down on a VFR plan. They honestly don't give a monkey's. If you like just put a couple of VORs or NDBs down that are very roughly on your route separated by the word DCT.
Not sure what you mean by an RNAV point but if you mean a published reporting point (what the Americans call an intersection) such as ORTAC or WILLO you can put those down too - again it doesn't much matter on a VFR plan.
BTW technically speaking your routing "syntax" was correct, but you need to separate the lon/lat waypoints with DCT (DCT should always be used unless they are points on a designated route (airway/ADR etc.) in which case the airway designator is used e.g. CPT G1 BCN).
On the radio the controller will find it much more helpful if you refer to a (biggish) town that is near the waypoint.
Hope that helps (and that I got most of it right!).