Wiring Inspection?

Free visual safety check offered by our Electricty supplier by a contracted company.
Testers eyes lit up when he saw our wired fuse consumer unit.
Tested two of 16 sockets with polarity tester then proceeded to tell me how dangerous the wired fuse box was, I knew otherwise as it had been tested 1yr previously. Price of new unit £800 he packed up and went didn't carry out anymore testing when I said I can't afford that. His interes was making a quick buck on the fuse box. Free area no stooping in cupboard and all cables come from attic. Any opinions on price fair or a stitch up because we are in the elderly 'see if I can frighten them into having it done' bracket. One thing when he saw the consumer unit his eyes lit up like organ stops. Also told me it's a £5,000 fine for replacing any electrics unless I'm Part P registered.
Not true I believe as long as you get in touch with council building control first then get the end resulting work tested and passed