The Norwich-born striker had no hesitation in accepting the chance to head north and help the Cumbrians in their fight to move off the bottom of the Division Three table. He featured in seven League games, an LDV Vans encounter and an FA Cup tie.
United now sit two places off the drop-spot and John feels his time spent at Brunton Park was a useful learning curve.
"I think I can learn a lot from it," he reflected. "Towards the end I got subbed a lot and didn't take too much from that though.
"In the time I was on the pitch I felt I did well and it will hopefully make me a better player now I am back at Tottenham."
There is a tendency among Premiership followers to suggest that Nationwide League combat is of a much more physical nature that would take some adapting to. John reasons that, from his experience, this is not necessarily the case.
"I'm not really sure it was more physical, just that the style of football is different. It is a bit scrappier and not as much passing. They look to try and get the ball forward a bit earlier.
"It is probably a little bit harder and I think I adapted to that quite well. Hopefully I can take good bits out of that game and stick it into my game down here.
"I got knocked about a little bit, but I really don't think it was that much tougher. It is probably not so good to watch as a supporter as the games are a bit more scrappy."
So was it a daunting prospect heading for the other end of the country to play for a team at the bottom of the Nationwide pile? John says the demands of a large support and playing for survival points were the noticeable differences from the football he is familiar with.
"I think we were bottom when I went there and we just about got off before the end. I think it's always good to get league experience because when you play in the reserves and youth team it is good, but there are not a lot of supporters there. If you lose the game it doesn't mean too much
"Up there it was playing for real points and it matters to a lot of people. Carlisle feel they are a big club and, in many respects, they are with the fan base they have got. They've got some quite big name players up there and that probably helped me a little."
John was not completely isolated in his temporary environment and, coming from Norwich, being away from home is not new to the 18-year-old.
"It was pretty much the same for me. Norwich is two hours away from here and when I was up there my brother was two hours away in Glasgow and my sister is in Middlesbrough. So it wasn't too bad."
Would he like to repeat the experience?
"It would depend really on what Glenn, Colin Calderwood and John Gorman feel. It would be about whether it would help me at Tottenham, because here is where I want to play."
John Sutton has returned from his loan spell at Carlisle United and hopes the experience gained will contribute to his quest for a bright future at Tottenham.