Nooooooooo!
Don't use crystal malt to adjust colour in British beers
Don't use invert
Don't adjust colour with anything except brewer's caramel or black malt.
Or just leave it, colour is not critical (qv Boddies).
As discussed, it's not mandatory, but it does have a distinct flavour (particularly in darker versions) but even if it was flavourless it still has a role to play in providing "easy" fermentables to dry out a beer to balance out crystal (and the lower attenuation of the more flavourful British yeasts). Going 1:1 invert : crystal is a good place to start but it does come down to personal taste - and in the UK, regional taste. It's worth noting that there's been a general trend among commercial breweries towards all-grain in recent years, encouraged by CAMRA, but that's not to say the use of sugar isn't widespread.
Definitely - certainly as they typically present at the bar.
Oh definitely, and the difference between 5% and 8% is significant. But it is the sort of thing that varies regionally and also between breweries, those kind of decisions contribute to house style. Fuller's use
7.2% light crystal (there's a homebrew version of ESB
later in that thread, from which you could derive Pride as they're partigyled). But that's about as high as I'd go without any sugar to counteract the sweetness; Yorkshire bitters are more like 2-3% and Boddies has none. So it depends what you're going for. But as a first go I'd definitely aim for a best strength of 4.2-4.4% - it's even tougher to balance everything below 4% - and have a nice pale malt with mebbe 5% crystal, 5% invert #1/golden syrup (or just say 3% crystal on its own), 1.5% chocolate malt - and plenty of gypsum.
It's better but still not the same.
WLP002 is too dull. I'm still working my way through some of the mainstream homebrew yeasts, partly through lack of brewtime, partly because I get to play with "real" yeast from cask dregs and some Brewlab strains. So I've had 1469 sitting in the fridge for ages, but people seem to like it, as I say I enjoyed my one brew with WLP041, WLP028 is popular here but is a bit more neutral, a lot of the Vault British yeasts are worth a go as and when they come out (although this year is not a great year for White Lab seasonals) - some of the
reviews of WLP038 Manchester sound very promising. Having said that there's a lot of smaller breweries here just using S-04 and Nottingham commercially, although not always with the best results... I've not tried it but others on HBT report that Imperial A09 Pub is has the same marmalade character as real Fuller's yeast has (but 002 and 1968 don't), which sounds promising.
It's worth pointing out that the main British beer thread on HBT is at
https://www.homebrewtalk.com/forum/threads/english-ales-whats-your-favorite-recipe.472464/ - there's 2000 posts there!