Hello Bryan
You have solved the mystery for me and I can't thank you enough! I will see if the name 'Dickens' rings a bell with mum.
I think that mum was probably at South Hill Farm and not Brook Farm thanks to your research. She joined the Land Army 3 May 1943 and left 31 October 1945 and worked on the same farm whilst she was in Northamptonshire. She was first billeted at Denton, then moved to Wilbye Grange, of which I've found a photo. It's such a coincidence that the Dickens lived at both Brook Farm and South Hill Farm. I'm wondering, though, where Derek Trevor Dickens was in 1939 and 1945, although he did marry in Jun Q 1945 and wonder what date the electoral rolls were taken.
I have looked at old photos and maps of Wellingborough Station and there is a footpath on the left hand side of the track which appears to lead up to Mill Road and then up further to Finedon Road where Brook Farm was. This was the track which I initially thought my mum would have taken but it seems much more probable, especially in view of the 1945 electoral rolls that she was at South Hill Farm. This seems to have had much more land around and I have some photos of mum in the fields on the farm if you would like to see them so you know who you've been researching for
The reason I couldn't find a marriage for a Trevor, father George, is because you found he was actually christened Derek Trevor and his father was Arthur George. I've think I've found Arthur George Dickens on he 1901 Census living with his parents Arthur and Mary at Weston Favell and on the 1911 they're at Grange Cottages, Overstone. Not sure about the Brixworth connection as according to the census Arthur Dicken was born at Boughton and his wife Mary at Moulton.
I would never have got any further had it not been your visit to the NRO today. I had looked at South Hill Farm as being a possibility but thought it was a little too far away. Taking another look at the Ordnance Survey Map 1948, I can now see the lane across from the railway station that leads up to South Hill Farm. I had a look on Google Earth to see if the farm still stands and it appears that it does, although the track/lane where my mum would have walked up looks to have disappeared and it seems to be accessed from Irthlingborough Road.
Looking at the 1945 electoral roll, it seems my mum was correct when she said that George's parents also lived on the farm and she remembers two brothers living there who may well be the ones listed after the Dickens family.
You've given me so much to go on and my aim is to research more about the Dickens family and try to trace any descendants of Derek Trevor Dickens and his wife and maybe I'll take mum down to see the farm where she worked in the early 1940's.
Once again, thanks for all the work you've done for me, it's much appreciated.
Best Wishes
Christine