We have some experience with jerseys - we've bought about several '000s in the last 6 years for the MacRide Events - a few comments:
1 After a false start in year 1 with a UK company we now buy from owayo (see above) - manufactured in Germany and delivered in about 3 weeks.
2 Price isn't everything BUT we found all actual ( i.e. not just agents) UK manufacturers - incl Impsport - to be expensive.
3 Beware of stonking price offers from China or the Indian sub-continent .... we are aware of bait-and-switch activity (send a sample that's OK but delivery a poor quality product from manufacture) - there is also the "
Nike issue" with the worker conditions that may or not be - and they usually demand payment up front.
4 Many of the UK based suppliers are merely agents for overseas suppliers, making a healthy margin from your order - and have lengthy lead times - AND want payment up front.
5 Sizes - make sure you get a set of size samples to check before placing an order - invariably the supplier's sizes are much smaller than UK expectations (we re-label our jerseys from oway one size smaller than they say!)
6 Sponsorship works - our jerseys (see my avatar) are fully-funded by the logo sponsors - that means that, in our case, every penny of the sale price (a competitive £34.50 this year) goes to Macmillan Cancer Support.
Rob