The front derry should be an easy fix - possibly just crudded up - spray all over with WD40 or equivalent, or strip/clean it and check the adjustment stops.
Without seeing it i'd think your LBS chap's frame has a value of £30 tops.
well just collected it earlier and i got home and noticed little hairline cracks on the rear wheel by the spokes and emailed seller ....well what a nice guy refunded me 60.00 of the purchase price plus sold mey brakes which were hanging in the cupboard my cindy cost me a meager £75.00
already replaced tyre at the front with a amber sidew all will do same with rear