Not many independent factors left, ECP have taken over the world.There were two independent factors that I used for 20+ years when I lived in Dunstable (Milehams & Dunstable Motor Factors).
I'd definitely avoid Starline - in fact my MOT man is always ranting at ECP when I go in, because they sent him Starline when he said any brand but Starline
If its a bastid job, sometimes branded is worth the extra to reduce the risk of having to do it again in 2 months...
Milehams still appear to have the same signage that they had 30 years ago, DMF looks the same but is now Dunstable Motor Spares. No idea if they are as good as they used to be, I haven't been near the town for 15 years.
It took me about 90 minutes to get the starter off, take the end cap off for a look-see and then reassemble everything so not a bastid job