**** customer service and damaging bikes (yes plural). Not to mention they aren’t cheaper as LBers get 10% off the already low Essential Rubber prices.
From where you are you could try Motorcycle Tyres UK at Horold Hill, down the A12 and turn right at the Harold Wood/Harold Hill split ( the last split before the M25 towards Brentwood). You can find them on Internet or Yell I’ve used them for years and great bunch and know there stuff while still being competitive with there prices.
I live about 100 miles from london and even i use them. Never had them fit a tyre but i always get them from there as they are the cheapest ive found anywhere
They fitted a new front tyre, carefully eased my chain adjuster that had seized (and warned me there could be some discolouring of the swing arm as they had to heat it up to get the thing to budge- there wasn’t but nice of them to warn me), checked my front pads and finding they were okay gave them a nice clean up. All done for £130 while I waited. An excellent fitter/mechanic and great customer service imho.