I think it is quite easy to find, i never come from that direction though.
I know where it is and i could get myself there but i couldn't direct anyone, which is no use to man nor beast and doesn't really answer your question!
Found it easily last year following the instructions on the schedule. Not going this year so won't see you there! Think there are directions on their website or if not schedule can be downloaded off of it First part off motorway you think you driving into a very built up area and there cannot be a farm but have faith there is!
Its very easy! I would email Joanna and then you can get them from the horses mouth so to speak. She would also be able to tell you if theres any traffic works/temp lights etc..
Also if you ring up, they will tell you the correct way to go, without going thru the 'low emmisions zone' where you have to pay for lorrys to go thru.
as there is a certain way to get to vicarage without going in the low emmisions area.