Tardis is a great product and the only tar remover i ever use, however please don't buy from Ebay! They post it illegally as it's a solvent based product and shouldn't be sent via royal mail as they do... Autosmart have been trying for ages to get Ebay to stop it.
See Elite Car care as you can buy 5L for £20 (Split it with friends if needed) but it's an amazing product! http://www.elitecarcare.co.uk/advanced_search_result.php?keywords=Tardis&osCsid=141625fc9e0c97b9e7e7948db7451d1b
For a polish by hand, you can't beat Autoglym Super Resin polish really, it leaves a nice finish but also contains fillers to help hide swirls and defects, that will leave a nice base for you to wax using your HD Wax.
T-cut is an old product, designed for solid colours and not for modern paints with clear coats so i wouldn't use it these days, there's far too many other products out there that are far more advanced and actually designed for modern paints and finishes.
Thanks