I took a watch to Asquiths that I'd bought my husband as a wedding present & the engraving was dreadful, thankfully it's on the side so not that noticeable but I have never been back. They weren't bothered at all when I said that they hadn't done a good job, just said it was hard to engrave!
I've used F Hinds for other things & they are v.helpful.
I had a similar experience with Suzelle's cakes in Southfields, I paid 3 figures for a Thomas the Tank engine birthday cake, despite having my son's name written in front of them, they mis spelt his name, rushed the redo so it looked dreadful & when I complained and insited that they re do it again, they made a right fuss and after all that it wasn't even a Thomas cake, my son pointed out that it had a number 2 on it so it was Edward not Thomas. The cake didn't even taste that nice so I won't be going back.