Hi mate,
Don't work at Aston do you!!? Is Tingrith the Toddington one? If so i'm not sure which one I fished name wise, but it was the bottom lake - I didn't realise at the time but we fished off the big peg, that we later found out is a disabled peg (no signs?)
If you can fish Newport I would recommend you go out another few miles and join the Milton Keynes Angling Association which is £30 per year. I am a member of both the MK and Newport waters, I'm not saying the Newport one isn't worth it (especially with fish like that) but if I had to choose I would recommend you went for a MKAA book as there are soo many more places to fish.
The Newport one is a few stretches of river and a complex with about 5 lakes on it.
The MK one is huge in comparison with 11 lakes, 9 stretches of river, MILES of canal and a couple of bonus waters in Oxford and Felmersham. Because of it's size of MK it seems to be more organised as well, with regular matches and baliffs a plenty.
For both of them you can pick up your membership from the Tackle shops in MK, I would recommend go-fishing in Wolverton (not far from Newport) as it seems to have all the latest stuff out and it's probably got biggest range of fishing stuff. There is a few others that do the membership to, Willards in Bradville and there is also one in Fenny Stratford.
Here is a link to both of them for you to have a look at..
http://www.npfa.org.uk/
http://www.mkaa.co.uk/
If you want to know any more info just let me know and i'll do my best to help you out,
Andy