Can someone recommend me a good place to string in London? Preferably South/East London. I usually go to Decathalon but was a bit mortified the other day when they told me they didn't like to string above 24lbs as with their machines tensions were higher than stated anyway and any more could break the racket?! What the hell's that all about. Couldn't even get the 25lb/26lb tension I wanted. Any advice would be much appreciated.