Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Tie no | Home team | Score | Away team | Date |
| --- | --- | --- | --- | --- |
| 1 | Chesterfield | 1–2 | Notts County | 29 November 1930 |
| 2 | Nelson | 4–0 | Workington | 29 November 1930 |
| 3 | Rochdale | 1–2 | Doncaster Rovers | 29 November 1930 |
| 4 | Walsall | 1–0 | Bournemouth & Boscombe Athletic | 29 November 1930 |
| 5 | Folkestone | 5–3 | Sittingbourne | 29 November 1930 |
| 6 | Gillingham | 7–2 | Guildford City | 29 November 1930 |
| 7 | Crewe Alexandra | 1–0 | Jarrow | 29 November 1930 |
| 8 | Lincoln City | 8–3 | Barrow | 29 November 1930 |
| 9 | Luton Town | 2–2 | Clapton Orient | 29 November 1930 |
| Replay | Clapton Orient | 2–4 | Luton Town | 4 December 1930 |
| 10 | Gainsborough Trinity | 1–0 | Scunthorpe United | 29 November 1930 |
| 11 | Scarborough | 6–0 | Rhyl Athletic | 29 November 1930 |
| 12 | Wrexham | 2–0 | Wigan Borough | 29 November 1930 |
| 13 | Ilford | 1–6 | Brentford | 29 November 1930 |
| 14 | Tranmere Rovers | 4–4 | Gateshead | 29 November 1930 |
| Replay | Gateshead | 3–2 | Tranmere Rovers | 3 December 1930 |
| 15 | Wellington Town | 0–0 | Wombwell | 29 November 1930 |
| Replay | Wombwell | 0–3 | Wellington Town | 4 December 1930 |
| 16 | Queens Park Rangers | 5–0 | Thames | 29 November 1930 |
| 17 | Fulham | 1–1 | Wimbledon | 29 November 1930 |
| Replay | Wimbledon | 0–6 | Fulham | 3 December 1930 |
| 18 | Accrington Stanley | 3–1 | Lancaster Town | 29 November 1930 |
| 19 | Bristol Rovers | 4–1 | Merthyr Town | 29 November 1930 |
| 20 | Northampton Town | 1–2 | Coventry City | 29 November 1930 |
| 21 | Norwich City | 2–0 | Swindon Town | 29 November 1930 |
| 22 | Northfleet United | 0–3 | Exeter City | 29 November 1930 |
| 23 | Carlisle United | 3–1 | New Brighton | 29 November 1930 |
| 24 | Tunbridge Wells Rangers | 3–0 | Kingstonian | 29 November 1930 |
| 25 | Crystal Palace | 6–0 | Taunton Town (1) | 29 November 1930 |
| 26 | Southend United | 0–1 | Torquay United | 29 November 1930 |
| 27 | Hartlepools United | 2–3 | Stockport County | 29 November 1930 |
| 28 | Halifax Town | 2–2 | Mansfield Town | 29 November 1930 |
| Replay | Mansfield Town | 1–2 | Halifax Town | 3 December 1930 |
| 29 | Southport | 4–2 | Darlington | 29 November 1930 |
| 30 | Dulwich Hamlet | 2–2 | Newport County | 29 November 1930 |
| Replay | Newport County | 4–1 | Dulwich Hamlet | 4 December 1930 |
| 31 | Walthamstow Avenue | 1–5 | Watford | 29 November 1930 |
| 32 | York City | 3–1 | Gresley Rovers | 29 November 1930 |
| 33 | Newark Town | 2–1 | Rotherham United | 29 November 1930 |
| 34 | Aldershot | 4–1 | Peterborough & Fletton United | 29 November 1930 |
Question:
What was the tie no when Watford was the away team?
Answer:
31.0