I need a canvas sling (safari/double rifle style) for my 308 rifle. Anyone wishing to sell one?

I would also like to buy a selection of 308 ammunition in expanding, various bullet weights and manufacturers to find best round for my new rifle. Otherwise I am faced with buying 20 at a time and potentially ending up with unsuitable ammunition. I am not sure my RFD would be happy about receiving them (would it not be a little cheeky when he sells them?) so would prefer to pick up. Hence must be reasonably near to Cambridge.