Jeremy Leaf, RICS spokesperson said: "It seems the current upward trend in the housing market is having a more significant effect on the lettings market, with many of the accidental landlords returning to the sales market to take advantage of the recent price increases. As a result the recent oversupply is reversing, with new instructions at the lowest levels we have seen. This of course is impacting on prices and tenants no longer have as strong a bargaining power as they did."