Beware if you are ordering seeds from Thompson and Morgan on-line - they have a number of special offers of plants and bulbs. But if you are tempted, they add on a separate P&P for the plants/bulbs, so for example, 40 narcissi, down from £9.99 to £3.49, has a P&P of £4.95 .... meaning your bill will go up by £8.44.

It's OK if you have already included plants in your order, because you'll already have incurred the P&P charge.