Hi Shaun,
Sorry to hear about your father. I had to do the same when my dad died 10yrs ago. A difficult time.
As for moving advice – much depends on the size of the machinery, the location and most importantly the access. If you can manage to give some idea about the above – perhaps some pictures – then advice will follow I'm sure. Your location would help too, it could be that there are some used machinery dealers local who could offer you a job-lot clearance service.
Advice I will give right away:
Small items have value too, especially if they are good quality. Many people will sell a machine and every tool that goes with it, not realising that often the tooling is worth more than the machine.
Get valuation advice from more than one source. Right here is a good place.
Workshop clearance specialists – proper ones – will get rid of everything for little hassle but also offer the least – they have overheads and need to make a profit plus they'll have to dispose of the 'rubbish'. Back-street ones will offer little more and might leave you the mess to clear up.
A very small amount of cleaning will increase the interest significantly. No-one wants to pay good money for a dirty, rusty, neglected machine covered in junk.
Pete.