I've raised £200 to help towards the upkeep of 6 kittens which have been found on my garden!

So where to start!!! Around a month ago we started seeing a stray cat hanging around.... after a week I took her to the vets to see if she was chipped but unfortunately she wasn't. I was told to take her home and leave her, not feed her or even acknowledge her. Two days later the vets called to say they had found her owner so back to the vets I go, the following day I get another phone call from the vet.... unfortunately it wasn't her owner so I had to take her back home again. The day after that I was hanging my washing out and heard her crying so I looked under the bush where she has been going and see 6 kittens! Nobody official seems to want to help me with them the rspca have said as the kittens aren't in any danger they won't help towards the cost of having them vet checked. It is costing a fortune just to feed them all until they are old enough to go to new homes and they really do need checking first to make sure they are healthy. Can anyone please help me get these poor babies checked and help towards their upkeep. Thank you in advance x