Ideas for stops between Grantham and Boston on the A52

[Epictantrum]

We're shortly to travel down this road on the way to Norfolk and we're going to need to stop along the way somewhere. We have elderly grandparents and a dog with us so ideally we need somewhere to stretch our legs, use the loo and maybe have a cup of tea. I've found Cogglesford watermill which looks good for the way back on a Sunday, but does anyone have any suggestions other than a horrible service station? I would have liked Easton walled gardens but dogs aren't allowed. Belton I think too much walking and rather pricey for a quick stop.
Thanks

There’s not much distance between Grantham and Boston, surely you don’t actually need to stop. Melton is only 2-3 miles from Grantham

Silk Willoughby Garden Centre?

Sorry, Belton not Melton

Or Woolsthorpe Manor, if Easton is out...

I’m trying to think of something but can’t. It’s really not a stretch of road with much to offer in the way of stops. You would probably be better looking for something before Boston or after Grantham depending on how long your journey is before you get to this leg of it.

Thanks all. Mum2jenny, our total journey is 2.5 hours, half way falls between these points. I’d usually not stop but we’ll have a car full and some are elderly so might need a break.
Silk willoughby looks good but adds more than 15 mins to journey. I think queenrollo is right, might need to look elsewhere. Someone should open a cafe, we have this problem every time we go to Norfolk.