JK2006 wrote:
Dead rats Honey.
I was thinking that JK, you're more than a pretty face.
Have a sort out in the celler and clear up the best you can. If your you and husband are good at repairing brick work, then do it. Seal any cracks, go around the celler with a pencil and slide it in gaps if goes through any holes then a rodent can come through it these are called entry points.
Don't store any food there in a celler like pet food. There has to be a reason for flies in the celler in which would be a food source.
I had this problem myself.
Also lay rat traps you want the ones that kills them, if you trap them and release they will come back.
www.trap-anything.com/rats-in-the-cellar.html
For flies: hang fly paper around the celler, get a couple bug zapper lamps in the celler, cans of Raid. Essential oils also.
brightstuffs.com/essential-oils-to-get-rid-of-flies/
Get yourself down a DIY shop or the B&M.