Posted: 08/12/2016 at 19:22
Rosie Bee, I'm also going to disagree with the initial advice. I've done exactly the same over the years and as long as you dig out what's under the block paving (which is usually laid on sand only), then there's no reason why not. Dig it out to a depth of 2 ft though and use fresh garden soil (I know you said clay) and plenty of the manure. If you're buying a David Austin, if it's bare root, they take a few years to really get going so some tlc with rootgrow, bonemeal, spring and midsummer feeds along with 2 gallons weekly for six months WILL see it establish well. Once in the roots will find their own way and more than likely straight out and down away from the wall. Just plant it a foot away from the wall and angle it in towards the wall, this will help training, and get your training framework in place just after planting. As it's west facing the prevailing wind and rain we get in the UK should mean it gets all it needs, however water in dry spells.