Ive had a think about this. Im a few hours drive from Reading but will be more than happy to help if needed.
1) A single lane shooting range. E.g. corridor. The chance to bring in guns and test them in a element free environment, with a chrono. Maybe charge at busy times, a few quid an hour will cover the chrono very quickly. Sell targets too!
2) An area where people can buy things in the shop, sit down, install them into the gun and then try them on the range. (Armoury Zone?) Obviously, they cant bring them back when used (unless faulty) but if will give them a chance to test out a new hop up down the range!
The social aspect would be huge, the shop would always have airsofters in, talking about guns, trying things out, helping each other.
3) Give people the opportunity to volunteer. It benefits you, as they can help out, tidy up, explain guns, help out in the "Armoury Zone", take deliveries AND it helps people with their C.V's, gets them experience in retail and with customers and they get to do something they love doing. If you don't trust them all that much, just dont put them on tills!!
4) If you are intending to sell gear as well as weapons, you could run a buy/sell, like "webuyanycar" or "Games" play and trade system. Or, if you feel that would take away too much business, how about an advertising board. It will get customers in the shop, and once they are in, half the battle is over!
Make it an Airsoft hub, not just a shop.
5) Show game dates for local sites (all or none, no favoritism unless they pay for it!)
6) Allow teams to put up "recruiting cards - Come meet the us, Jungle Warriors at the shop on 23-04-2012 if you are interested in joining a team!" Again, more feet through the door.
7) Subcontract out repairs to good gun smiths, some of which i bet you could find on here. You guarantee the customer that the work will be excellent, and take your cut - the gunsmith actually gets work, and after a while a constant supply.
8) *My Experience here* Make it light. Airsoft shops can be unapproachable. Bunch of guys sitting around in a darkened room with guns all over the walls. Games Workshop, is in my opinion, less accessible than airsoft. But parents will go into these shops and say "A pack of Ork... Sluggas?" because the shops are open, light and the staff are friendly.
9) Strike up some deals with local sites. This could be anything really, but if it helps the both of you get business, then why not. You give vouchers for a small % off the walk on fee (gets you customers in, gets them more players) they send their guns to you for repairs (for cheaper than they currently get it if possible. But you already have a cheap, subcontract out so you are still making a profit! )
10) Be competitive. So there are no shops physically near you, dont get comfortable. Us airsofters have been living off the internet for a while, and we know where to go to get what we want. Offer deals, "We will beat wolf armories by £25 on any weapon for two weeks only". Force that guy that cant decide if he really wants a new M4 to get it NOW because its cheaper. If you cant beat it, then offer a game day on you at the local site and a 5% off voucher for the store (not a big loss to you as you have your deal with that local site, and he will need new bb's, possibly new boats and hell, maybe even a new sight after his game. Where is he gonna go? The place where he has 5% off, no?)
What do you think?