Welcome onboard
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Looks like someone beat you to it and booked them before you. If someone cancels, SCP seating may become available but you'll be lucky if they do. TOM133/4 are indeed operated by an ex-FCA bird. Personally, I find Star Class more than adequate and don't bother upgrading. I prefer to put the £300 towards a nice hotel and get the benefit for 2 weeks or use it for diving or activities in resort. I got back from Mombasa with them on monday evening, flights were their usual high standard. There isn't a drinks price list online but to give you an idea (from memory): lager is £2.50 a can (330ml Stella), shorts £2.70-£3 and mixers £0.70. Hot drinks are £1.80, 500ml bottles water £1.60. You've pretty much got the gist of the main perks with SCP over SC. You can upgrade the IFE in SC to the SCP pack for £5 and you'll also get an extra 3kg luggage allowance in SCP.
Darren