Thanks for the heads up Phil, think that did the trick!

A combination of your advice about the nolock option and this post 
(http://www.ryananddebi.com/2013/01/15/linuxmint-or-ubuntu-how-to-automount-synology-shares/)
 
got me a working setup. No need to match UID etc.

<NAS IP>:/volume5/LinuxBackups /var/lib/backuppc nfs rw,hard,intr,nolock 0 0

Thanks for the prompt replies all round. Hopefully others with similar 
issues will find the above useful.

regards, Tom

On 24/09/2014 22:33, Phil Kennedy wrote:
> Tom,
> You may want to try mounting with the 'nolock' option. I had a similar
> issue with a D-Link NAS. It's a quick and easy fix to try.
> ~Phil
>
> On 9/24/2014 2:01 PM, Tom Fallon wrote:
>> Well I've since removed the /etc/fstab as server hung after a reboot but
>> it did look like this:
>>
>> <IPofNAS>:/volume5/LinuxBackups        /var/lib/backuppc nfs
>> defaults  0       0
>>
>> The NAS still has contents on it so previous comments from Les are the
>> likely scenario I suspect.
>>
>> How would I go about finding the UID on the backuppc user on the NAS?
>>
>> regards
>>
>> On 24/09/2014 18:50, Carl Wilhelm Soderstrom wrote:
>>> On 09/24 06:41 , Tom Fallon wrote:
>>>> Hi Sharuzzaman
>>>>
>>>> I'm mounting with a user with sudo rights, not backuppc and not root itself
>>>> as on Ubuntu thats disabled by default.
>>> What does your /etc/fstab configuration look like?
>>>
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