Hi Ian,
It's a long way from Lincolnshire to Mere Beck!
I'd agree with Bill, Mere Beck is a lovely fishery and as the number of anglers is limited, it never gets to busy, and is one of my favourite fisheries.
http://www.merebeck.co.uk/ Which reminds me ..... I haven't been for a few weeks!
With regards a magazine giving it a bad review a few years ago, it may have been when it was first opened and a day ticket was £100 per day (they were trying to keep the number of anglers down) but the prices for the last 2 or 3 years have been reasonable.
If you're in the area, then Mere Beck it is well worth a visit - but phone and let them know you are coming. With regards fishing, the methods mentioned by Bill will definately catch you fish, but be prepared to ring the changes depending on the weather, on bright days the fish go deep.
You won't need to bring a flask, as there are free tea / coffee making facitilites in 2 of the small lodges around the lakes!