Why not:
Hook VRP to Yeovilton, climbing to FL40 when past Hook. Then up to FL60 if you really want to, once past Andover. You should have Farnborough Radar all the way to 30 nm past Farnborough - about as far as Andover. Then perhaps Solent (depending on their mood). Not much LARS after that at the weekend - so after Solent have finished with you that'll probably be it unless you can raise anyone at Yeovilton (unlikely).
After Yeovilton, I would suggest to Tiverton which is shortly after the centreline of N864 (BHD and BCN VOR should help) - you should be able to get a service of some sort from Exeter. After Tiverton, route direct to the St Mawgan NDB, then down the coast to Perranporth. WATCH OUT FOR D011 - avoid it by making sure you fly to the overhead of Okehampton (it's on your track). St Mawgan/Newquay may give you some type of service before you call Perranporth.
Enjoy the trip however you plan to do it. But I'd avoid the South Coast and the inane RT jabberings of the Le Touquet Lunch Team.....
