Dear Chris,
              Thank you for your reply, but I must answer some points that you 
put forward
1. I recognise that the boundary theory has been widely accepted, but that 
does not mean that is the true interpretation and I am fully aware that the 
Trackway theory was in place over one hundred years ago, but no one so far 
as I know has ever considered the probability that pack animals were used in 
the Bronze Age.There have been hundreds of widely accepted theories that 
have eventually fallen by the wayside. There is an element of the Emperors 
clothes fable at work here.
2. You mention that the reaves would make a boundary of 3-4 feet high and 
that topped by a hedge would make a stock proof boundary. It is patently 
obvious that this is not true. In many places there was never enough material 
to build a 3-4 foot wall and no kind of hedge could ever have survived, and 
even if it did it would not stay stockproof for long(ask any Dartmoor farmer). 
There are huge gaps on hard rocky places where stock could easily wander 
through. Fleming states that rivers and streams formed part of the boundaries. 
Have you ever tried growing a hedge in a stream or river? 
3. You suggest that the miners were paid to recover tin and would not have 
the time or desire to make trackways. You could also say that they would not 
have time or inclination to make pointless and ineffectual boundaries.
4. In all probability the workforce were not paid in the Bronze Age. It was 
normal practice in the Bronze Age for wealthy tin traders to have an endless 
supply of slaves. Even slaves had to kept alive, so it was important to have 
an infrastructure and supply system in place. Slave camps needed access 
routes for food, firewood, salt, etc. In all probability (I always think in terms of 
degrees of probability) some kind of pack animal was being used to supply the 
workforce, and to take off the tin ore to the coast. It seems that at first the 
raw casitterite was added to the copper ores (Black Tin) to make the bronze. 
It was only later that smelted tin metal (White Tin) was exported.
5. Your suggestion that reaves continued on the opposite slope after being 
interupted by subsequent tin working. This cannot be demonstrated as far as I 
know, and I would be happy to recieve evidence to the contrary. In most 
cases where the reave terminates at tin workings the reave stops short and 
continues down as a hollow way. At what point in prehistory or history did 
they decide that the boundaried were no longer of any use. They were clearly 
disregarded at some point if the miners obliterated them. If they were 
intended to be boundaries why would they destroy what they had so carefully 
built.
There is one case where a reave disappears under a bog. I have probed this 
and found that the bog has risen over the reave just as has happened to the 
bog roads of Ireland, the Sweet Track of Somerset and the packhorse tracks 
of the Pennines and North York Moors. 
I am happy that you have put forward these objections, and will happily reply 
to any others that spring to mind.
Best Wishes  and many thanks, Roger.