I don't think you can get a tripod&head or flash that is truly worth getting for £70.
Buy cheap buy twice.
That is such a cliché and I never understand why people keep reiterating it.
What on earth is wrong with 'buying twice'?
When people start out in photography, they'll buy a low-level consumer DSLR. If they stick with it, they're likely to upgrade to something at enthusiast or pro level. Does that mean they should have splurged on full frame straight away? No, because they're unlikely to reach the limitations of their cheaper purchase for quite some time.
It's pretty similar with any accessory or lens.
My first tripod was a Hahnel Triad 80, cost me 50 quid. As sturdy as they come, but super heavy and a bit tedious to put up. Did the job perfectly at the time though. I kept it as a back-up and after 2 years, when my bank balance looked a bit healthier, I invested 350 quid in Manfrotto 055CXPRO4 legs and a 322RC2 head. Sure it's better, sure I'm unlikely to upgrade again, but would I have wanted to spend 2 years tripod-less until I could finally afford it? No way.
I didn't have an immediate requirement for a flashgun, so when I did buy it I went for a not-so-cheap Nikon SB600, because that's what was in my pricerange at the time. Now, a few years on, I'm considering an upgrade to an SB900. Does that mean I bought the wrong thing in the first place? No it means I still had a decent flashgun in the meantime.
There is nothing wrong with buying cheaply, it just takes a bit more research when you still want something good for whatever money you do have. With tripods - first and foremost - make sure it's a sturdy one, because anything flimsy and light is likely to fall over and destroy your gear in the process.
Another advantage of buying cheaply to start out is that you'll figure out whether you really need that piece of kit at all. No point blowing 350 quid on a tripod or 250 on a flashgun that only get used twice a year because you find you mostly shoot handheld in broad daylight.
That aside - I'm with all the others who have stated that it very much depends on what you're shooting whether you have more of a requirement for a tripod than a flash or the other way round.