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There's nothing wrong with the B75 - apart from the missing folding left pedal - but if it's the spec you want then it's not such a great deal.
If you put a completely flat bar on a B75 you'll end up with much lower handlebars than the factory flat bar (S) because the stem is shorter and they're hard to buy separately. MTB riser bars are a common upgrade. It's a standard 25.4mm clamp and all the accessories are 22.2mm, so you have lots of choices.
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The Islington CC rule was an arbitrary decree introduced after a couple of complaints from members who said they felt uncomfortable riding in groups with people not wearing helmets. If anyone’s telling you it’s due to insurance they’re talking shite.
(Helmets were optional for several years before the rule came in, although 99% of riders wore them, so it’s possible to operate a BC club without a compulsory helmet rule)
You can fit the B75 shifters and levers to any bars you like. The new gear lever design isn’t necessarily an improvement.