Stronglight road triple here. Spa cycles fitted it for me for nowt, too, 10 minutes after they were supposed to close.
You won’t get a smile or any sales patter in Spa cycles. What you will get is a bunch of blokes who know everything about bikes, have a huge and esoteric parts inventory, and know how to look after a customer.
If you want advice about what you need, options etc, or if you want them to do any quick jobs, like fitting a new BB or cranks or whatever, ring them beforehand and ask if it’s OK. They’ll sigh and then say “yep – come in early”. Then get in early when they’re quiet, and they’ll be more than happy to pass the time of day with you.