£300??????
Have a look at a Napoleon Rodeo Pro its around £250.00 (I have one) its like a Weber but with better mods and you can Hot grill, Low and slow, Hot smoke, cold smoke and do anything with them. with £50 left get a chimney starter and a Thermapen,
But I think I am getting close to an Ideal set up for me with a GMG DB, Napoleon Pro, 2 x UDS now all I want is a Pizza Oven!!! with the oven I will be about £1500 in