I have had poor experiences of Park Lane/Battersea. They did not order warranty parts in advance, so warranty work couldn't be completed. The service which they assure dme would be done by mid-day took until 5.00 pm. They had no concept of customer service, never returned calls either before or on the day, and their service receptionist seemed to think that because things weren't his own personal responsibility, I had no right to complain about them.
While I was there waiting, three other customers came in to complain about the standard of work done on their bikes. One of these was a serious mistake that could potentially have been extremely dangerous (not tightening up the handlebar mounts on a K75S). My service seemed to be carried out OK.
Incidentally, they told me they had ordered the part I needed but they were on back order, and they'd call me when they received it to arrange fitting. I called them again after three or four weeks, and was told (eventually) "they're still on back order, don't worry, we will contact you." Shortly afterwards, I went to Cannons in Braintree, explained the problem, they ordered the parts, called me in a week, and have now carried out the work. For all I know, Park Lane still have my part sitting on a shelf somewhere.
I may have caught them at a bad time, and I think they were without a Service Manager at the time, but once bitten, twice shy...