Hi,
Invest in a small pocket notebook and a pencil and walk round the local shops. Boots do 3 for 2 prices from time to time and discount film when short dated; often you can get both in one go. Film will be OK for a week or four beyond the "develop by" date. Some of us still use B&W APS film and can't remember when they stopped making that in the 90's, perhaps?
Morrison's supermarket does Fuji C200 in 24 exp's at £7 for 3 cassettes; good for testing local 1 hour labs (some good and some so-so imo).
Go on ebay.co.uk and look at item no: 290519603437 (Kodak ColorPlus at 5 for £8-50 in 24 exp's; that's £1-70 a can), dirt cheap and good for testing etc.
Look at all the other things they do when looking at the above film on ebay; f'instance sample packs of 3 B&W films (Agfa APX and Kentmere 100 and 400 from memory). Plus everything else in the film line, including 5"x4" sheet.
Look at 7dayshop on the www.
Above all, write it down, sort out the delivered price and then make a choice.
Labs that suit you will probably be one local 1 hour place and Peak or Ilford for B&W. And thanks to the Govt there's a lot of small one man and a dog firms advertising B&W developing and scanning services. But your 1 hour lab may be happy to develop and scan for about £3 or so a film. Asda locally suit me fine...
Regards, David
PS (Edit) Just noticed jj's comments re😛eak - their scans are excellent, imo