Thank you Rojie, Lucky87 and others, what a helpful bunch you are!
Anyway, made some phone calls and no special tools needed as long as you're prepared to take the axel down. It's apparently a bit of job, I'm told. Found a local garage in Perranporth that will do it next week. Rileys Garage. Very helpful!
Interestingly, the Toyota dealerships i phoned wanted nothing to do with servicing my Alphard๐
Thanks again
Thys