Hiya Lisa, sorry I haven't stayed at Tattershall, but I looked at their website and I must admit, I'm glad you brought it to my attention. My two fav sports on one site can't be bad : )
It reminds me of Tallington Lakes, also in Lincolnshire, this site manly caters for statics but it is great out of season as well, it is quiet and peaceful, the ducks roam free and the pitches are hard standing. The people in the bar/club house were absolutely brilliant.
Have tried Bainland too, but its such a busy site you just don't get that personal touch.
If you decide on Tattershall, let me know how you get on, you have me very interested now.