I would suggest bankside pins just incase you cannot find a mooring.As for moorings,they are not in abundance,there are 48hr moorings at Wandsford,24 hr moorings at Ferry meadows,you can also moor up at ALwalton agacent to the lock.Im not sure if ARC membership is open to non members but if it is then thats the solution to mooring up on the nene,for a fiver,i can moor at any club on the nene and if i brake down, the closest club will send a tow boat out,there are clubs at Peterborough,Alwalton,Oundle and tichmarsh.
i am a member of Peterborough,its a vry friendly club of 400+ members and 104 moorings.If you are coming down to peterborough call in at the club,we often have visitors stopping over for a night or two, we have showers,toilets fresh water,diesel and beer at the weekend,its close to Orton and ferry meadows and VERY secure.
I can get you some usefull numbers for the EA.As has already been said,you do need a winlass for the gates and an abloy key,ive never used an anchor on the nene in 2 years of motoring up and down it